Z3-B5

 is a group within Zero Project. The theme of the group is K-Pop.

The first line-up was announced in June or July 2022.

The second line-up was announced on August 14, 2022.

Current Members

 * Kaito (カイト; ) (Founding Member; Rejoined November 29, 2022)
 * Kisumi Megu (姫菫めぐ; ) (Joined August 14, 2022; Rejoined November 29, 2022)
 * Kokeshi (こけし; ) (Joined November 29, 2022)
 * Seru (セル; ) (Founding Member; Rejoined November 29, 2022)
 * Rui (るい; ) (Founding Member; Rejoined November 29, 2022)

Former Members

 * MIWOO (Founding Member)
 * Yuri (ユリ) (Founding Member)
 * Aizu Mei (藍住明以) (Founding Member)
 * Shio Yukina (紫桜倖那) (Founding Member)
 * Minazuki Reine (水無月黎音) (Founding Member)
 * Maria (まりあ) (Joined August 14, 2022)
 * Kotoha (ｺﾄﾊ) (Joined August 14, 2022)
 * Kusaka Hiiro (日下緋彩; ) (Founding Member)