Z5-B5

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

The first line-up was announced on July 9, 2021.

They made their stage debut on August 14, 2021 @KANDA SQUARE HALL.

The second line-up was announced on December 4, 2021.

The third line-up was announced in March 2022.

Current Members

 * Uzuki Ria (兎月りあ) (Joined July 10, 2023)
 * Tanaka Sena (田中沙奈) (Joined July 10, 2023)
 * Mine Haruka (峯遥香) (Joined July 10, 2023)

Former Members

 * Akimoto Maria (秋元まりあ) (Founding member; Graduated November 12, 2021)
 * Alyssa (ありさ) (Founding member; Graduated November 12, 2021)
 * Kanekawa Miyabi (金川雅) (Founding member; Graduated November 12, 2021)
 * Soli (소리) (Founding member; Graduated November 12, 2021)
 * Nanase Ren (七瀬澪) (Founding member; Graduated November 12, 2021)
 * Binnie (びに) (Joined December 4, 2021)
 * Marin (麻鈴) (Joined December 4, 2021)
 * Nagumo Wakana (南雲和奏) (Joined December 4, 2021)
 * Runaha Emiri (三原千夜) (Joined December 4, 2021)
 * Lisa (リサ) (Joined December 4, 2021)