Z3-B4

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

The first line-up was announced on September 17, 2022.

Current Members

 * Sakurazaka Ai (桜坂愛衣; ) (Joined August 2023)
 * Kamino Saya (神乃さや; ) (Joined August 2023)
 * Akaishi Rena (赤石玲菜; ) (Joined August 2023)
 * Sakurai Minami (桜井みなみ; ) (Joined August 2023)
 * Hiiragi Aoi (柊あおい; ) (Joined August 2023)

Former Members

 * Kanzaki Chisato (神崎千聖; ) (Founding Member)
 * Kumayuri (くまゆり; ) (Founding Member)
 * Sawada Nana (澤田なな; ) (Founding Member)
 * Aino Momo (愛乃もも; ) (Joined October 25, 2022)
 * Ichigozaki Mayu (一期崎まゆ; ) (Joined October 25, 2022)
 * Kiri (きり; ) (Joined October 25, 2022)
 * Yamada Nao (山田菜緒; ) (Joined October 25, 2022)
 * Yayoi Megu (弥生めぐ; ) (Founding Member)
 * Rukino (るきの) (Joined December 28, 2022)
 * Misaki Rikka (みさきりっか; ) (Joined December 28, 2022)
 * Aimi Yuka (藍南ゆか) (Joined December 28, 2022)
 * Kayano (かやの; ) (Joined December 28, 2022)
 * Hikari (ひかり; ) (Joined December 28, 2022)
 * Aone Konoha (蒼音このは) (Joined May 24, 2023, Contract suspended June 16, 2023)
 * Todoroki Shizuku (轟雫玖) (Joined May 24, 2023)
 * Yukina Yuki (雪名ゆき) (Joined May 24, 2023)
 * Aisaka Yuuna (逢坂ゆうな) (Joined May 24, 2023)
 * Kisumi Megu (姫菫めぐ) (Joined July 2023)
 * Pu~ko・Fuwanhowaa~ (ぷ〜こ・ふわんほわぁ〜) (Joined July 2023)
 * Yuu. (夕. ) (Joined May 24, 2023)
 * Rio (りお) (Joined July 2023)