Group Action

 (集団行動; Shudan Koudou), is a Japanese pop band formed in January 2017. Mabe Shuichi and Nishiura Kensuke were former members of Yakushimaru Etsuko's band, Sotaisei Riron. On January 1, 2021, the band announced on their official website that they were going to go on hiatus indefinitely (probably due to COVID, although no specifics were given), but band members will continue with personal activities.

Current Members

 * Mabe Shuichi (真部脩一)（Guitar)
 * Saito Rina (齋藤里菜)（Vocals）
 * Nishiura Kensuke (西浦謙助)（Drums）
 * Micchii (ミッチー)（Bass）

Albums

 * 1) [2017.06.28] Shudan Koudou (集団行動; Group Action)
 * 2) [2018.02.07] Juuban Mirai (充分未来)
 * 3) [2019.04.03] SUPER MUSIC

Digital Singles

 * 1) [2018.08.08] Teacher? (ティーチャー？)
 * 2) [2018.10.03] Crime Suspense (クライム・サスペンス)
 * 3) [2019.01.30] The Crater (ザ・クレーター)
 * 4) [2019.09.25] Girl Talk (ガールトーク)
 * 5) [2019.10.23] Cuticle (キューティクル)
 * 6) [2019.11.20] Magic Tape (マジックテープ)