That Time I Got Reincarnated as a Slime season 1

That Time I Got Reincarnated as a Slime is an anime television series based on the light novel series of the same title written by Fuse and illustrated by Mitz Vah. The anime is produced by animation studio Eight Bit and directed by Yasuhito Kikuchi, with Atsushi Nakayama as assistant director, Kazuyuki Fudeyasu handling series composition, Ryouma Ebata designing the characters, and Takahiro Kishida providing monster designs. Elements Garden is composing the music. The series follows a man who is killed and reincarnated in another world as a slime named Rimuru.

That Time I Got Reincarnated as a Slime
Season 1
Key visual
No. of episodes	24
Release
Original network	Tokyo MX
Original release	October 2, 2018 (2018-10-02) – March 19, 2019 (2019-03-19)
Season chronology

The first season aired from October 2, 2018, to March 19, 2019, on Tokyo MX and other channels. The series is simulcast by Crunchyroll with Funimation streaming an English dub as it airs. The season ran for 24 episodes. An original animation DVD was originally scheduled to be released on March 29, 2019, bundled with the 11th manga volume, but it was delayed to December 4, 2019, bundled with the 13th manga volume. A second original animation DVD released on July 9, 2019, bundled with the 12th manga volume. Three more original animation DVDs have been announced, with the third OAD being released on March 26, 2020, bundled with the 14th manga volume. The fourth OAD is being bundled with the 15th manga volume, which releases on July 9, 2020. The fifth OADs was bundled with 16th manga volume, which releases on November 27, 2020.

The first opening theme song is "Nameless Story" performed by Takuma Terashima, while the first ending theme song is "Another Colony" performed by True. The second opening theme song is "Megurumono" (メグルモノ) performed by Terashima, while the second ending theme song is "Little Soldier" (リトルソルジャー, Ritoru Sorujā) performed by Azusa Tadokoro.

Episodes

No. overall	No. in season	Title	Directed by	Storyboarded by	Chief animation directed by	Original air date
1	1	"The Storm Dragon, Veldora" Transliteration: "Boufuu Ryuu Verudora" (Japanese: 暴風竜ヴェルドラ)	Atsushi Nakayama	Yasuhito Kikuchi	Ryōma Ebata	October 2, 2018 (2018-10-02)
One day, office worker Satoru Mikami is killed after being stabbed, but not before requesting for his friend to destroy the contents on his computer. He awakens in a cave in an unfamiliar fantasy world to discover that he has been reincarnated as a slime, possessing various skills formed from his final thoughts before death, and also includes an A.I. helper called the great sage. While exploring the cave, gaining new skills along the way with the aid of a great sage residing in his mind, the slime comes across and befriends an ancient dragon named Veldora, who was sealed in the cave centuries ago. Meanwhile, Satoru's friend keeps his promise by destroying Satoru's computer.
2	2	"Meeting the Goblins" Transliteration: "Goburin-tachi to no Deai" (Japanese: ゴブリンたちとの出会い)	Shintaro Inokawa	Masashi Kojima	Ryōma Ebata	October 9, 2018 (2018-10-09)
The slime, who is given the new name of Rimuru Tempest, helps Veldora to find a way to break his seal by using his Predator skill to swallow him inside his body and analyze it from both sides; Veldora's disappearance causes unrest in the outside world. After gaining more skills from swallowing other creatures, Rimuru finds his way out of the cave after three human adventurers, who were sent to search for Veldora's whereabouts, opens the entrance. Rimuru then encounters a group of goblins, who ask for his help in protecting them against a group of Direwolves.
3	3	"Battle at the Goblin Village" Transliteration: "Goburin Mura de no Tatakai" (Japanese: ゴブリン村での戦い)	Shin Tosaka	Takaomi Kanasaki	Junichi Takaoka	October 16, 2018 (2018-10-16)
Working together with the goblins, Rimuru battles against the Direwolves and kills their leader, forcing them to surrender. Convincing the goblins and Direwolves to live together in harmony, Rimuru gives them all names, but then passes out for three days due to exhausting his magic. When he wakes up, he discovers the names he had given to the goblins and Direwolves had caused them all to evolve into hobgoblins and Tempest Star Wolves. The son of the Direwolves' deceased leader swears allegiance to him. Realizing that the goblins have no skills to craft houses and clothes, Rimuru and a small group set off to the town of Dwargon to seek help from dwarf artisans.
4	4	"In the Kingdom of the Dwarves" Transliteration: "Dowāfu no Ōkoku Nite" (Japanese: ドワーフの王国にて)	Tokugane Tanizawa	Taizo Yoshida	Kenichirō Katsura	October 23, 2018 (2018-10-23)
Arriving at Dwargon with Gobta the goblin, Rimuru ends up getting in a fight with some thugs and is thrown in jail. Rimuru is eventually set free after providing the guards with potions and is introduced to Kaijin the blacksmith. Using the magisteel ore he had gathered in the caves, Rimuru helps Kaijin to fulfill an order of longswords in exchange for his help in providing artisans for the goblin village. As Rimuru and the dwarves celebrate at an elf bar, a figure approaches.
5	5	"Hero King, Gazel Dwargo" Transliteration: "Eiyū-ō Gazeru・Dowarugo" (Japanese: 英雄王ガゼル・ドワルゴ)	Yoshihiro Mori	Junichi Takaoka	Junichi Takaoka	October 30, 2018 (2018-10-30)
A fortune teller elf decides to predict Rimuru's destined one, showing him a vision of a girl parting ways with her family. When Vesta, the minister who ordered the swords, arrives and insults Rimuru due to his disgust for monsters, Kaijin punches him in anger, resulting in both him, Rimuru, and the other dwarves getting arrested and put on trial. During the trial, the hero king Gazel Dwargo, who has a history with Kaijin, exiles him and his men, who join Rimuru as his team of artisans. After also exiling Vesta for his dishonest actions, Gazel, noticing Rimuru's connections with Veldora, dispatches a ninja to follow him.
6	6	"Shizu" (Japanese: シズ)	Yasuhiro Ito	Masashi Kojima	Kenichirō Katsura	November 6, 2018 (2018-11-06)
When the group of adventurers who Rimuru saw earlier have discovered Veldora's disappearance from the cave, Eren, Kaval, and Gido, are ordered by a guildmaster to investigate the forest; a masked girl named Shizu asks to join them. When they run into trouble, they are rescued by Rimuru, who recognizes Shizu from the elf's vision. As Shizu reveals she was summoned to this world from Japan during the war, Rimuru shares some of his memories of a modern, peaceful Japan. What Rimuru doesn't know, however, is that Shizu's summoner, the demon king Leon Cromwell, has made her the vessel of the fire spirit Ifrit.
7	7	"Conqueror of Flames" Transliteration: "Bakuen no Shihai-sha" (Japanese: 爆炎の支配者)	Atsushi Nakayama	Masashi Kojima	Kenichirō Katsura	November 13, 2018 (2018-11-13)
Shizu recalls the anguish she felt when Ifrit inside her killed her friend after considering her an enemy. Just as Shizu prepares to leave with the adventurers, Ifrit once again takes control of her and unleashes his flames upon the village. With his water attacks proving ineffective, Rimuru copies Eren's ice magic spell to take care of Ifrit's minions. Discovering that he is immune to fire attacks, Rimuru uses his Predator ability to swallow Ifrit, separating him from Shizu in the process and trapping him inside of his stomach along with Veldora.
8	8	"Inherited Will" Transliteration: "Uketsugareru Omoi" (Japanese: 受け継がれる想い)	Takumi Dōyama	Katsumi Terahigashi	Takashi Mamezuka	November 20, 2018 (2018-11-20)
Shizu tells Rimuru about someone known as the Hero who took her in and showed her the right path before mysteriously disappearing one day. Sensing her life is coming to an end, Shizu, not wishing her body to remain in this world, asks Rimuru to eat her, giving him the ability to take a human form that resembles a younger version of Shizu. He then informs the others of Shizu's death. As Rimuru decides to seek out information on Leon in order to convey Shizu's final words to him, a masked man named Gelmud recruits an orc that he names Geld with the intention of bringing forth a great orc disaster in the forest.
9	9	"Attack of the Ogres" Transliteration: "Dai Kizoku no Shūgeki" (Japanese: 大鬼族の襲撃)	Shin Tosaka	Katsumi Terahigashi	Junichi Takaoka	November 27, 2018 (2018-11-27)
As Rimuru familiarizes himself with the form and abilities he inherited from Shizu, he discovers that he is genderless. The goblins come under attack by a group of ogres, who claim Rimuru has been manipulating orcs to attack their village. After a show of strength, Rimuru manages to convince the ogres that he is not their enemy and invites them to the goblin village to talk things over.
10	10	"The Orc Lord" Transliteration: "Ōku Rōdo" (Japanese: オークロード)	Tokugane Tanizawa	Hidetoshi Namura	Kenichirō Katsura	December 4, 2018 (2018-12-04)
Learning that the orcs who attacked the ogre village were being led by a masked majin, who is revealed to be Gelmud, Rimuru proposes that the ogres join him as his subordinates. Agreeing to a temporary alliance until the orcs are defeated, Rimuru names the ogres Benimaru, Shuna, Shion, Hakurou, Souei, and Kurobe, evolving them into kijins. Meanwhile, the chieftain of the lizardmen, sensing an Orc Lord is controlling the thousands of orcs heading their way, sends his son, Gabiru, to enlist help from goblins.
11	11	"Gabiru Is Here!" Transliteration: "Gabiru Sanjō!" (Japanese: ガビル参上！)	Yoshifumi Sasahara	Taizo Yoshida	Takashi Mamezuka	December 11, 2018 (2018-12-11)
It has been a few days since Benimaru and other kijins joined Rimuru. Gabiru arrives at Rimuru's village to try and get everyone to serve under him to fight the orcs. Gobta is sent in to duel against Gabiru, defeating him quickly with the skills he's learned and forcing the lizardmen to retreat. Later, Rimuru is approached by a dryad named Treyni, who asks him to defeat the Orc Lord.
12	12	"The Gears Spin Out of Control" Transliteration: "Kuruiyuku Haguruma" (Japanese: 狂いゆく歯車)	Yoshihiro Mori	Munenori Nawa	Takashi Mamezuka & Kenichirō Katsura	December 18, 2018 (2018-12-18)
Treyni explains that the Orc Lord has used a unique skill "Starved" on the Orcs, causing them to constantly crave sustenance, go berserk, and even eat their own to gain more power. Accepting Treyni's request, Rimuru sends Souei to negotiate with the lizardmen for an alliance. As the chieftain urges his soldiers not to engage in battle with the orcs until Rimuru's group arrives, Gabiru, swayed by the words of Gelmud's messenger Laplace, usurps the chieftain's position and leads the lizardmen into a direct attack on the orcs, unaware of the Orc Lord's true power.
13	13	"The Great Clash" Transliteration: "Dai Gekitotsu" (Japanese: 大激突)	Atsushi Nakayama	Shinji Itadaki	Kenichirō Katsura	December 25, 2018 (2018-12-25)
Rimuru's group comes across Gabiru's sister, who informs them of Gabiru's coup d'etat and asks them to rescue the chieftain and save the lizardmen. Meanwhile, Gabiru and his troop find themselves cornered after the orcs eat one of the soldiers and gain their powers. As Treyni discovers Gelmud and Laplace and forces them to leave the forest with the help of a light spirit, Gabiru struggles against the Orc General, but is rescued by the arrival of Rimuru's group. The gang defeats the general and most of the orc army while Souei rescues the chieftain, after which Rimuru goes to confront Geld the Orc Lord.
14	14	"The One Who Devours All" Transliteration: "Subete o Kurau Mono" (Japanese: 全てを喰らう者)	Yasuhiro Ito	Masashi Kojima	Takashi Mamezuka	January 8, 2019 (2019-01-08)
Gelmud suddenly appears, revealing he created the Orc Lord in order to turn him into a new Demon Lord. After failing to beat Rimuru, Gelmud is killed and devoured by Geld, who evolves into the Demon Lord Orc Disaster which proves too powerful for the kijins to defeat. Realizing Geld's power, Rimuru has the great sage take control of his body in order to fight against him, but after Geld develops fire resistance, Rimuru resumes control and engages in a battle with Geld to see who can consume the other first. Learning that Geld was on a search to end the famine afflicting his people before he was manipulated by Gelmud, Rimuru devours his sins along with his body. Afterward, as the orcs are freed from Starved's effects, the kijins decide to continue serving under Rimuru.
15	15	"The Jura Forest Alliance" Transliteration: "Jura no Mori Dai Dōmei" (Japanese: ジュラの森大同盟)	Akira Yamada	Katsumi Terahigashi	Junichi Takaoka	January 15, 2019 (2019-01-15)
Rimuru forms the Jura Forest Alliance to allow the lizardmen, goblins, and orcs to live together in harmony, inadvertently ending up as the alliance's chancellor. Rimuru bestows the name of Geld onto the Orc Lord's son, evolving him into Orc King and the other orcs into High Orcs. Then he gives the lizardmen chieftain the name Abiru. Later Gabiru is excommunicated and exiled from the lizardmen and embarks on a journey. Three months later, Dwarf King Gazel learns of Rimuru's actions and the Orc Lord's defeat. He and his army travel to the Goblin Village to challenge Rimuru to a duel and determine his true nature. After Rimuru succeeds in blocking all of his strikes, and upon learning the two share the same swordmaster (Hakurou), Gazel accepts he is not evil and offers a treaty between their groups. The Jura Tempest Federation is formed and recognized as an official nation.
16	16	"Demon Lord Milim Attacks" Transliteration: "Maō Mirimu Raishū" (Japanese: 魔王ミリム来襲)	Munenori Nawa	Yasuhito Kikuchi & Masashi Kojima	Kenichirō Katsura	January 22, 2019 (2019-01-22)
Two days after forming an alliance with Rimuru, Gazel visits again, bringing Vesta, who apologizes to Rimuru and Kaijin for the trouble he caused in the past and begins to work for them as a researcher. Gabiru and his sister, along with several other lizardmen, also become Rimuru's servants, evolving into dragonewts after Rimuru names them. Sometime later, four Demon Lords: Milim Nava, Clayman, Frey, and Carrion, learn of Rimuru and the Orc Lord's defeat. Milim takes an interest in the Jura Forest and goes there to see Rimuru. Fearing for their master's safety, Ranga and the Kijins appear to defend Rimuru, but can do little against her overwhelming power. In the end, Rimuru calms Milim down by putting some honey into her mouth and the two become friends, with Milim deciding to live in the village with him. Despite being relieved that she will not attack them anymore, Rimuru's council gets concerned with Milim and Rimuru's new friendship, as the other Demon Lords can view it as a threat to their own balance of power.
17	17	"The Gathering" Transliteration: "Tsudōsha-tachi" (Japanese: 集う者達)	Shin Tosaka	Masashi Kojima	Junichi Takaoka	January 29, 2019 (2019-01-29)
Vesta succeeds in developing a full potion to equal Rimuru's potions, prompting Rimuru to attempt negotiations to develop low potions in the city. Just then, Phobio, beastkeeper of the Demon Lord Carrion, comes to Tempest with the intent of taking it over but is promptly dealt with by Milim before Rimuru resolves things peacefully, offering Milim a new weapon in exchange for information. Later, the Border Survey Corps led by a man named Youm, joined Eren's party, and come to Tempest, where Rimuru asks them to take credit for defeating the Orc Lord. Meanwhile, the Demon lord Clayman takes an interest in a powerful beast known as Charybdis and sends Tear the harlequin to investigate.
18	18	"Evil Creeps Closer" Transliteration: "Shinobiyoru Akui" (Japanese: 忍び寄る悪意)	Yoshihiro Mori	Masashi Kojima & Yasuhito Kikuchi	Kenichirō Katsura	February 5, 2019 (2019-02-05)
While Phobio fumes over his humiliation at Milim's hands, Tear and Footman, two of Clayman's harlequin, approach and convinces him to become a Demon Lord himself so he can get revenge on Milim. All he must do is let Charybdis possess his body and maintain control. Phobio breaks the seal on Charybdis. Tear reveals she was under orders to revive Charybdis and send it Milim's way. Treyni's sister, Trya, warns Rimuru of the revival. Born from a cloud of Vledora's magicules, Charybdis is the mindless ruler of the skies, focused only on destruction. It has summoned thirteen megalodon from the Spirit World to aid in its rampage and is heading to Jura. Rimuru and the Dwargon Empire prepare for battle.
19	19	"Charybdis" Transliteration: "Karyubudisu" (Japanese: 暴風大妖渦（カリュブディス）)	Atsushi Nakayama	Yasuhito Kikuchi & Risako Yoshida	Takashi Mamezuka	February 12, 2019 (2019-02-12)
Assisted by 100 Pegasus Knights from Dwargon, Rimuru's forces destroy the megalodons and attempt to destroy Charybdis with a full-scale attack, but fail. Rimuru then battles Charybdis himself, only to discover it is possessing Phobio, and its true target is Milim, who was kept out of the battle earlier. By Rimuru's request, Milim defeats Charybdis while sparing Phobio's life. After the battle, Phobio apologizes for all the trouble he caused, and his master, the Demon Lord Carrion, establishes a non-aggression pact with Tempest. Rimuru and the others finally discover that all the troubles they had faced recently were caused by Clayman's harlequin gang: the Moderate Harlequin Alliance.
20	20	"Yuuki Kagurazaka" (Japanese: ユウキ・カグラザカ)	Tokugane Tanizawa	Masashi Kojima	Junichi Takaoka	February 19, 2019 (2019-02-19)
The city celebrates its victory with a filleted megalodon. That night, Rimuru has a dream about Shizu's regret over not being able to help her students; five children brought into this world. Rimuru goes to the Kingdom of Ingrassia with Ranga to see them. There, he meets Yuuki Kagurazaka, the grandmaster in charge of the children, a teenager himself. Yuuki arranges for Rimuru to teach Shizu's students but warns him that while the two of them are Otherworlders who came here, the children are Summons meant to be weapons for the Summoner. They have so much energy in their young bodies that it will kill them within five years. Rimuru vows to honor Shizu's wish and find a way to save them. Rimuru states that it has been two years since he was reincarnated in this world; thus putting Millim's arrival at least a year after the Orc Lord incident.
21	21	"Shizu-san's Students" Transliteration: "Shizu-san no Oshiego-tachi" (Japanese: シズさんの教え子達)	Ōri Yasukawa	Katsumi Terahigashi	Takashi Mamezuka	February 26, 2019 (2019-02-26)
Shizu's students don't show Rimuru much respect so he decides to show them the difference in their skills in a series of duels. Kenya uses fire magic, Chloe uses water magic, Gale fires magic bullets, Ryota uses body enhancements, and Alice uses puppetry to control toys to attack him. They lose and accept him as their sensei. Rimuru visits Treyni, believing the children will survive if inhabited by superior spirits since Shizu was Summoned as a child but lived to adulthood, possibly because of Ifrit. Treyni directs him to the Dwelling of Spirits, but with the Queen of Spirits the dryads once served dead, they have lost their link to it and no longer know the entrance. While on a picnic with the students, they see a Sky Dragon heading to the capital and Rimuru interferes and eats it with Gluttony. Mjolmire, a merchant whose Rimuru's appearance is saved, invites them to dinner. Mjolmire knows who Rimuru is and Rimuru invites him to come to Tempest to help them sell their wares. He agrees. Mjolmire's assistant asks the Queen of Spirits to protect the children after dinner. She tells a curious Rimuru she came from a village near the Dwelling of Spirits. He, Ranga, and the children head to its location.
22	22	"Conquering the Labyrinth" Transliteration: "Meikyū kōryaku" (Japanese: 迷宮攻略)	Shige Fukase	Shinji Itadaki	Hideki Sakai	March 5, 2019 (2019-03-05)
Rimuru, Ranga, and the students enter the Dwelling of Spirits and a spirit in the opening labyrinth battles them with a giant metal golem to test them, though Rimuru quickly incinerated it. The labyrinth spirit introduces herself as Ramiris, one of ten Demon Lords, though she's so small no one believes her. She explains that Leon, who summoned Shizu, used to be a Hero before he fell from grace and become a Demon Lord. Likewise, she used to be the Queen of Spirits before dying and returning as a Demon Lord. In exchange for creating a new golem for her, Ramiris agrees to aid Rimuru in summoning superior spirits.
23	23	"Saved Souls" Transliteration: "Sukuwareru tamashii" (Japanese: 救われる魂)	Shin Tosaka	Masashi Kojima	Junichi Takaoka	March 12, 2019 (2019-03-12)
A plethora of inferior spirits answer the prayers of Gale, Alice, and Ryota so Rimuru devours them and turns them into three new superior spirits, which successfully inhabit the three. Kenya summons and is inhabited by a superior spirit of light. An unknown spirit-like being appears Veldora reacts to its presence. Despite Ramiris's attempt to stop it, as she feels it is dangerous, it still possesses Chloe. Regardless, the dangerous energy in the five children has calmed, so they will not die in a few years. Rimuru makes a new golem for Ramiris and they return to Ingrassia. Yuuki finds it unlikely the nations that abandoned the children will try to take them back so they should be able to live normal lives. Rimuru doesn't tell Yuuki how he saved them. Rimuru thinks about the past two years and declares all their problems have been solved. He gives Chloe Shizu's magicule-suppressing mask but isn't certain why, simply feeling it was for the best. Unknown to Rimuru, a shady woman is spying on him.
24	24	"Black and a Mask" Transliteration: "Gaiden: Kuro to Kamen" (Japanese: 外伝：黒と仮面)	Munenori Nawa	Shinji Itadaki	Ryōma Ebata	March 19, 2019 (2019-03-19)
A dying woman summons a demon to avenge her and her partner and the demon agrees to her request, deciding it would be an amusing distraction. Shizu's memory: Shizu is summoned to the Kingdom of Filtwood with other adventurers to stop a demon from taking its remains under the castle and reviving it. Upon hearing the Silver Wings, a pair of famous adventurers, were killed by the nameless demon, some try to withdraw. The minister refuses to let them leave, revealing some are possessed by demons, which causes paranoia among the group. One of the crowd, the demon from before, starts laughing, claiming the knights summoned the lesser demons but does not explain. Hired to kill a demon, he reveals he intends to kill all the other adventurers present to find the responsible party. Shizu refuses to let that happen and duels with the being, who calls himself "Kuro." One of his blows is reflected by Shizu's mask and takes off his arm. He decides to withdraw, saying the fight was amusing because Shizu was able to hurt him. Afterward, Shizu recalls how Leon told her the most powerful demons were the progenitors, known by colors like Rouge (red) and Noir (black). One of the knights summons her to the king and takes her to the castle. It is revealed the king and minister were puppets of the same demon she was hired to stop, who has taken on the persona of Orthos, the hero who previously defeated him, thus gaining the name Orthos and becoming an archdemon. They intend to sacrifice the adventurers and Shizu, who is still worn out from her fight, to regain his full strength. Orthos is able to defeat her but Kuro timely appears and kills the king and minister. He reveals he was summoned by the dying Silver Wings to avenge them and kept his promises. He scolds Orthos for being overconfident despite being dependent on Rouge and destroys his soul. Officially, the king and minister were killed by Kuro, who Shizu then defeated. As long as they keep their stories straight, Kuro says he has no reason to target Shizu before leaving. In the post-credits, Kuro observes Rimuru through a scrying glass and declares that next time Rimuru will lead him "to the truth of this world."
24.5	24.5	"Tales: Veldora's Journal" Transliteration: "Kanwa: Verudora Nikki" (Japanese: 閑話：ヴェルドラ日記)	Atsushi Nakayama	N/A	N/A	March 26, 2019 (2019-03-26)
Ifrit, who has been trapped in Rimuru due to the latter's Predator skill, recaps events of the season while in a discussion with Veldora as they play Shogi.
OAD1	OAD1	"The Tragedy of M?" Transliteration: "Gaiden: Emu no Higeki?" (Japanese: 外伝：Mの悲劇？)	Shintaro Inokawa	Masashi Kojima	Takashi Mamezuka	July 9, 2019 (2019-07-09)
Sick of Shion and Shuna's tug-a-war for his attention, Rimuru decides to make a cushion in his image. Acquiring spandex for the exterior, Rimuru is stumped on a substitute for Styrofoam pellets. Learning of a special sand that's similar, Rimuru takes a group to a lake to collect it. After avoiding Shion's cooking, Rimuru leads everyone in a swim to collect the sand. They are attacked by a monster that was driven insane by a rice ball Shion made; its slime dissolves everyone's swimsuits, and Rimuru settles the problem. Despite the success of the Rimuru cushions, Shion and Shuna continue Rimuru's tortuous tug-a-war; Benimaru and Souei can only pity their master.
OAD2	OAD2	"Hey! Butts!" Transliteration: "Gaiden: HEY! Shiri!" (Japanese: 外伝：HEY！尻！)	Makoto Nakata	Taizo Yoshida	Takashi Mamezuka	December 4, 2019 (2019-12-04)
Rimuru teaches the citizens of Tempest about sumo wrestling.
OAD3	OAD3	"Rimuru's Glamorous Life as a Teacher, Part 1" Transliteration: "Gaiden: Rimuru no Karei na Kyōshi Seikatsu Sono 1" (Japanese: 外伝：リムルの華麗な教師生活 その1)	Atsushi Nakayama	Taizo Yoshida	Hideki Sakai	March 26, 2020 (2020-03-26)
Rimuru, who is teaching Shizu's students as a substitute at the Kingdom of Ingrassia's Freedom Academy, takes part in an orientation in actual field combat in the school's annual outdoor training event. Transfixed by the prize he gets if he wins, he accepts a challenge from the teacher Jeff. However, an enemy appears before the students...
OAD4	OAD4	"Rimuru's Glamorous Life as a Teacher, Part 2" Transliteration: "Gaiden: Rimuru no Karei na Kyōshi Seikatsu Sono 2" (Japanese: 外伝：リムルの華麗な教師生活 その2)	Shige Fukase	Shinji Itadaki	Hideki Sakai	July 9, 2020 (2020-07-09)
Rimuru, now a teacher at the Freedom Academy in the Kingdom of Ingrassia, has become involved in the school's outdoor training event with his class. The outdoor training event is an annual competition in which the students of each class guard the teachers on a journey to a nearby town. Rimuru is assigned to Class A, while his own students in Class S escort the young Tiss-sensei. All the students are eager to show how much their daily training has paid off, but the situation turns around when they're attacked by thieves!
OAD5	OAD5	"Rimuru's Glamorous Life as a Teacher, Part 3" Transliteration: "Gaiden: Rimuru no Karei na Kyōshi Seikatsu Sono 3" (Japanese: 外伝：リムルの華麗な教師生活 その3)	Ōri Yasukawa	Shinji Itadaki	Tomoko Ito, Keiya Nakano & Hideki Sakai	November 27, 2020 (2020-11-27)
Tiss and the Class S students have made it through the first exercise of the Freedom Academy's annual outdoor training event. Class S has arrived first at the destination, the mansion of Count Guratol, and now they're ready to begin the second exercise, a cave exploration... but awaiting them there are thieves (the same ones that Rimuru encountered earlier) who hope to kidnap the students and make a fortune returning them for ransom money. Just when it seems like Rimuru's students have fought them off thanks to the skills he taught them, they realize a monster is lurking among the thieves: a Spectre! It is too strong for them, but they are saved by Kuro.

International broadcast

The series is available with multilingual subtitles on iQIYI in South East Asia.

External links

• Official website (in Japanese)
• Official website at Crunchyroll
• That Time I Got Reincarnated as a Slime at IMDb (Season 1)
• That Time I Got Reincarnated as a Slime season 1 (anime) at Anime News Network's encyclopedia