ONE BY ONE

 was a Japanese female idol group formed on March 20, 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.

On April 14, 2022, a new member line-up was introduced.

On November 1, 2022, it was announced that the group would enter a period of inactivity after the graduation of Kanamaru Saki on November 30, 2022.

On February 7, 2023, all members of the final lineup formed a new group: Snacc.

Final Line-up

 * Utakata Asahi (泡沫あさひ; ) (Joined April 14, 2022)
 * Sakura Hana (桜良はな; ) (Joined April 14, 2022; Leader)
 * Tachibana En (橘媛; ) (Joined April 14, 2022)
 * Ayase Ririka (彩星りりか; ) (Joined April 14, 2022)

Former Members

 * Saya Kubo (さや久保; ) (Founding Member; Graduated December 31, 2021)
 * Toda Corone (戸田ころね; ) (Founding Member; Graduated December 31, 2021)
 * Niina Mako (新菜まこ; ) (Founding Member; Graduated December 31, 2021)
 * Nishioka Kengo (西岡健吾; ) (Founding Member; Graduated December 31, 2021)
 * Watanabe Kiri (渡辺樹莉; ) (Founding Member; Graduated December 31, 2021)
 * Azuki Komugi (愛月こむぎ; ) (Joined April 14, 2022; Graduated September 6, 2022)
 * Hinata Rin (陽向 凛; ) (Founding Member; Graduated December 31, 2021; Re-joined April 14, 2022; Fired September 14, 2022)
 * Kanamaru Saki (金丸紗希; ) (Founding Member; Graduated December 31, 2021; Re-joined April 14, 2022; Graduated November 30, 2022)

Unreleased Songs

 * 1) one's ambition
 * 2) restart