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.

Current Members

 * Kotoa (コトア) (Founding member)
 * POLLIE (ポリ) (Founding member)
 * Fujimiya Karen (藤宮かれん) (Founding member)