Z5-B4

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

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

 * Aiba Chiho (Joined December 4, 2021)
 * Hoshina Fuka (Joined December 4, 2021)
 * Midoriishi Ui (Joined December 4, 2021)
 * Sorano Hina (Joined December 4, 2021)
 * Taketori Runa (Joined December 4, 2021)

Former Members

 * Mito Chinami (美藤千波) (Founding member; transferred September 19, 2021 )
 * Momo Teyan (ももてゃん) (Founding member; Graduated between October 9th and November 2021)
 * Miru (みる) (Founding member; Graduated between October 20th and November 2021)
 * Kusaka Hiiro (日下緋彩) (Founding member; Graduated November 12, 2021)
 * Yamashita Moe (山下萌) (Founding member; Graduated November 12, 2021)