Z4-B3

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

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

 * Nagamiya Rea (永宮れあ) (Founding member)
 * Utagawa Hina (宇田川ひな) (Founding member)
 * Yamashita Moe (山下萌) (Founding member)
 * Takayama Riko (髙山理子) (Founding member)
 * Shirosaki Matsuri (白崎まつり) (Founding member)