Z5-C4

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

The first line-up was announced on July 10, 2021.

They made their stage debut on August 14, 2021 @KANDA SQUARE HALL.

The second line-up was announced on August 14, 2022.

Current Members

 * Amaha Rio (天羽莉桜) (Joined December 28, 2022)
 * Emoto Nagi (絵本凪) (Joined December 28, 2022)
 * Tanaka Pochi (田中ポチ) (Joined December 28, 2022)
 * Yoshinaga Runa (吉長瑠奈) (Joined December 28, 2022)
 * Rya (Joined December 28, 2022)

Former Members

 * Mi-chan (みちゃん) (Founding member; Withdrew before November 7, 2021)
 * Sumeragi Momo (皇もも) (Founding member; Graduated November 7, 2021)
 * Yuzuki Misato (雪月みさと) (Founding member; Graduated November 12, 2021)
 * Ayagumo Aya (彩雲あや) (Founding member; Graduated November 14, 2021)
 * Uzuki Yun (兎月ゆん) (Founding member; Graduated November 14, 2021)
 * Takase Miku (高瀬 みく) (Joined August 14, 2022)
 * Hanamaki Kie (花巻きえ) (Joined August 14, 2022)
 * Maonyan (まおにゃん) (Joined August 14, 2022)
 * Jinguji Naasa (神宮司菜朝; ) (Joined August 14, 2022)
 * Ruki (るき; ) (Joined September 17, 2022)
 * Mafuyu (真冬; ) (Joined September 17, 2022)
 * Okada Nana (岡田なな)
 * On Reika (温翎禾)
 * Hinokami Inori (日之上いのり; ) (Joined September 17, 2022)
 * Merochii (めろちぃ; ) (Joined September 17, 2022)
 * Moharu (もはる)
 * Yoi (宵) (Joined October 25, 2022, Graduated November 29, 2022)