Z3-C4

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

The first line-up was announced in April 2022

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)
 * Ichigozaki Mayu (一期崎まゆ; ) (Joined November 29, 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)