ONE BY ONE

 is a Japanese idol group formed in March 2021.

On December 6, 2021, it was announced that all members would graduate on December 31, and that the group would restart at a later date.

Former Members

 * Kanamaru Saki (金丸紗希; ) (Graduated December 31, 2021)
 * Saya Kubo (さや久保; ) (Graduated December 31, 2021)
 * Toda Corone (戸田ころね; ) (Graduated December 31, 2021)
 * Niina Mako (新菜まこ; ) (Graduated December 31, 2021)
 * Nishioka Kengo (西岡健吾; ) (Graduated December 31, 2021)
 * Hinata Rin (陽向 凛; ) (Graduated December 31, 2021)
 * Watanabe Kiri (渡辺樹莉; ) (Graduated December 31, 2021)