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

 * Sakaguchi Kotone (坂口琴音; ) (Joined December 28, 2022)
 * Natsuna Rika (夏菜莉歌; ) (Joined December 28, 2022)
 * Fuka (柊果) (Joined January 14, 2023)
 * Yuu. (夕. ) (Joined November 29, 2022)
 * Watanabe Suzu (渡辺すず) (Joined November 29, 2022)

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)
 * Isshiki Hiyori (一色陽頼; ) (Joined November 29, 2022)
 * Hirata Mitsuki (平田みつき; ) (Joined November 29, 2022)
 * Miyamori Nozomi (宮森のぞみ; ) (Joined November 29, 2022)
 * Yozuki Ayu (夜月あゆ; ) (Joined December 28, 2022)