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.

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)