Z4-B4

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

The first line-up was announced on November 20, 2021.

They made their stage debut on November 21, 2021 @Ebisu Garden Hall.

Current Members
None currently

Former Members

 * Nanase Saaya (七瀬さあや) (Founding member)
 * Hanai Rurina (花井瑠莉奈) (Founding member)
 * Kato Rico (加藤理子) (Founding member)
 * Akimoto Maria (秋元まりあ) (Founding member)
 * Hinata Marino (日向まりの) (Founding member)