Z5-B3

 is a group within Zero Project. The theme of the group is powerful.

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.

Current Members

 * Hayami Suzuka (Joined December 4, 2021)
 * Himemiya (Joined December 4, 2021)
 * Ide Ryoko (Joined December 4, 2021)
 * Kozakura Purple (Joined December 4, 2021)
 * Shio Yukina (Joined December 4, 2021)

Former Members

 * Ito Mikana (伊藤望叶) (Founding member; Withdrew between September and November 2021)
 * Shirosaki Matsuri (白崎まつり) (Founding member; Graduated November 12, 2021)
 * Sakuma Nana (佐久間七菜) (Founding member; Graduated November 12, 2021)
 * Noichigo Mikuru (野苺みくる) (Founding member; Graduated November 12, 2021)
 * Hanai Rurina (花井瑠莉奈) (Founding member; Graduated November 12, 2021)