Z4-D4

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

The first line-up was announced on November 20, 2021.

They made their stage debut on November 21, 2021 @Ebisu Garden Hall.

The second line-up was announced in March 2022.

Current Members
None currently

Former Members

 * Watagashi Mio (綿菓子ミオ) (Founding member)
 * Sakuraba Niko (桜庭にこ) (Founding member)
 * Sioreta JK (しおれたJK) (Founding member)
 * A-rin (あーりん) (Joined March 2022)
 * Iwakawa Mirai (岩川美礼) (Joined March 2022)
 * Suzu-chan (すずちゃん) (Joined March 2022)
 * Ayase Nanami (綾瀬ななみ) (Joined March 2022)
 * Asakura Yuzuki (浅桜ゆづき) (Joined May 2022)
 * Tachibana Kanon (橘花音) (Joined March or April 2022)
 * Himekawa Rin (姫川りん) (Joined March or April 2022)
 * Rui (るい) (Joined May 2022)