Migma Shelter

On August 9, 2016, Koji Tanaka and Hiroaki Taniyama began recruiting members for a new idol girl group.[1] In October, Amari and Kotejun became the first two members of the group.

In January 2017, former Bellring Shōjo Heart member Yoneko (formerly Kanra) joined the line-up. Seisei, Mimimiyu and Komachi also joined the line-up in late January. On March 5, the group's name was finalised as Migma Shelter.[2] On July 15, the group debuted with the single "Svaha Eraser". On October 13, the group released the limited single "Amazing Glow".[3] On October 29, Popo Popo Po Popo Jr. was revealed as a new member. On December 27, the group's first EP, Orbit EP, was released. On December 31, Yoneko announced that she would graduate from the group on February 10, 2018.[4] On March 31, Seisei graduated from the group.[5] On May 27, it was announced that the group would go hiatus from July 8 in order to find new members.[6] On July 8, Amari, Kotejun, Komachi and Popo Popo Po Popo Jr. graduated from the group.[7] Before going on hiatus it was announced that a new member named Brazil would join the line-up.[8]

On February 26, 2019, new members Shyshyko, Tamane, Yubune and Misonee joined the group.[9] On March 19, the group released the single "Parade's End".[10] On April 19, former There There Theres member, Arisaka Reina joined the group using the name Rere.[11] On May 21, Misonee went on hiatus. On July 4, Shyshyko withdrew from the group.[12] On July 16, "Names", was released.[13] On September 7, Nananara joined the group.[14] On October 15, "Tokyo Square" was released.[15]

On June 12, 2020, Misonee who had been on hiatus graduated from the group.[16] On August 26, the group's first album, Alice, was released.[17] On December 23, "Paralyzing" was released. On July 20, 2021, "Coro Da Noite" was released.[18] On June 7, 2022, Yubune graduated from the group.[19] On August 9, "Redo" was released.[20] On December 13, former HO6LA member Wanya+ and former Dolly Kiss member Yuinon joined the group.[21] Nananara graduated from the group on December 30.[22] On April 11, "Oz One" was released.[23] Rere graduated from the group on April 29.[24] On July 9, Nagimuh, Suimi, and Merisa joined the group. "Oz Two" was released on August 8.[25] Mimimiyu will graduate from the group on November 22.[26]