Kobayashi was an Aoyama Gakuin University student, she appeared in Much Ado About Love as a "graduating class eighth". She sits at the front row. Much Ado About Love starred, it is a chance that had been multiplied by the voice in the cultural festival of Keio University. In 2003, Kobayashi was joined as a TBS announcer. She synchronized with Takahiro Takano and Yuriko Takahata. After six months, Kobayashi appeared as a reporter in All-Star Thanksgiving. In Atarasu~inihongo, she was chaired with Summers. From its flirts specific deportment, Kobayshi was born to say the words "Maya Kashii". In the Shin su ~i ￮￮! after the program renewal, she continued appearing in attendant role of Tetsuya Takeda as a student teacher. In October 2004, Kobayashi became a fourth generation assistant in Chubawdesu yo!. In December 2004, she served as the facilitator in the Japan Record Award. Kobayashi was in charge for five consecutive years until 2008 (mostly hired as a female TBS announcer). From March 28 to April 1, 2005, she appeared in TBS Radio & Communications' Kodansha Radio Books (Kodansha in the recitation of the offer), the first radio program at the time of her appearance (joining the introduction of an announcer, except Yurino Osawa yūyūwide, etc.) The same year in autumn, Kobayashi served as a regular for the first time in Buzios!. She served as a caster in the 2006 FIVB Volleyball Women's World Championship, which was held on October 31 to December 3, 2006, she did cheering, interviews, etc. Kobayashi was also appointed to the International Convention Relay of Volleyball. In February 21, 2007, while heading by taxi to the studio for the recording of Chubawdesu yo!, the vehicle was in a rear-end collision. She went to the hospital between recording, the same day when the program was recording. In a follow up visit on the 22nd, Kobayashi had been diagnosed with Cervical Spine, Lumbar, Thoracic Sprain (symptoms of the so-called "whiplash"), hospitalization. It was healed for three weeks, the doctor said, "worry, sorry for the inconvience". In the 27th, she came out of the hospital and was absent during the recording of the 1,000 anniversary conference of Discovery of the World's Mysteries. In March 3, Kobayashi was discharged in the evening and returned in the live program of the 10th King's Brunch. In March 29, 2009, she left TBS to become a freelance presenter. On the same day, she left Discovery of the World's Mysteries as co-host, and she was replaced by Mai Demizu. With her sister, Mao, they belonged to Cent Force in the form of business partnership. In March 30, 2009, she opened an official Ameba blog. Kobayashi served as the main caster of TBS' Sōryoku hōdō! The News. In March 26, 2010, Sōryoku hōdō! The News ended. In April 1, 2010, she was responsible for the moderator of BS Japan's Maya Kobayashi no hon ni aitai. It was Kobayashi's first regular program responsible other than TBS.