Z3-C4

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

The first line-up was announced in April 2022.

The second line-up was announced on November 29, 2022.

The third line-up was announced on January 14, 2023.

Current Members
None currently

Former Members

 * Kusaka Hiiro (日下緋彩) (Joined May 2022)
 * Sawada Nana (澤田なな) (Founding Member)
 * Hazuki Rio (はづきりお) (Founding Member)
 * Yamada Nao (山田菜緒) (Joined May 2022)
 * Kisumi Megu (姫菫めぐ) (Founding Member)
 * Kiri (きり; ) (Joined November 29, 2022, Graduated December 28, 2022)
 * Misaki Rikka (みさきりっか; ) (Joined November 29, 2022)
 * Yayoi Megu (弥生めぐ; ) (Joined November 29, 2022)
 * Wakamiya Yuriko (若宮ゆりこ; ) (Joined Late May or June 2022, Re-joined November 29, 2022)
 * Aito Sakura (愛桃さくら; ) (Joined January 14, 2023)
 * Harupon (はるぽん; ) (Joined January 14, 2023)
 * Mikuriya Kureha (御厨紅遥) (Joined March 6, 2023)
 * Aizuki Shino (藍月しの; ) (Joined January 14, 2023)
 * Ichigozaki Mayu (一期崎まゆ; ) (Joined November 29, 2022, Re-joined March 6, 2023)
 * Sakurazawa Kotone (桜沢琴音; ) (Joined January 14, 2023)
 * Hiiragi Aoi (柊あおい; ) (Joined January 14, 2023)
 * Mikuriya Kureha (御厨紅遥) (Joined May 24, 2023, Contract suspended June 16, 2023)
 * Kotoha (ｺﾄﾊ) (Joined May 24, 2023)
 * Sakura Hono (佐倉帆乃) (Joined May 24, 2023)
 * Nono (ﾉﾉ) (Joined May 24, 2023)
 * Yayoi Megu (弥生めぐ) (Joined May 24, 2023)