Z4-D5

 is a group within Zero Project. The theme of the group is K-Pop.

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

 * Kotoa (コトア) (Founding member)
 * POLLIE (ポリ) (Founding member)
 * Fujimiya Karen (藤宮かれん) (Founding member)
 * BINNIE (Joined March 2022)
 * Momose Riho (桃瀬凛歩) (Joined March 2022)
 * Imada Miri (今田未莉) (Joined March 2022)
 * Kaito (カイト) (Joined March or April 2022)
 * Saho. (Joined March 2022)
 * Yuri (ユリ) (Joined March 2022)