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

 * Umehara Shizuno (梅原しづ乃) (Joined July 14, 2022)
 * Kira Alice (吉良ありす) (Joined August 14, 2022)
 * Kokeshi (こけし) (Joined August 14, 2022)
 * Hayasaka Kaho (早坂かほ) (Joined August 14, 2022)

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)
 * 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)
 * Wendy (Joined July 2022)
 * Sato Nao (佐藤なお) (Joined July 14, 2022)
 * Fukazawa Karin (深澤架琳) (Joined July 14, 2022)
 * Pochiko (ぽちコ) (Joined July 2022)