On September 16, it was announced that tripleS would begin preparing for sub-unit debut activities with each unit having 4 members. The two sub-units were named Acid Angel From Asia and +(KR)ystal Eyes, with Acid Angel From Asia having their debut activities first in October.[3] The lineup was voted by fans and Acid Angel From Asia made their official debut with the first extended play Access on October 28, 2022.[4]