Z5-D4

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

The first line-up was announced on July 11, 2021.

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

The second line-up was announced on December 4, 2021.

Current Members

 * Futaba Mai (双葉まい) (December 4, 2021)
 * Miyagishi Satsuki (宮岸咲紫姫) (December 4, 2021)
 * Miyamoto Airi (宮本愛莉) (December 4, 2021)
 * Momoa Mahiro (桃愛まひろ) (December 4, 2021)
 * Watarai Urumi (綿来うるみ) (December 4, 2021)

Former Members

 * Mizukoshi Sae (水越早咲) (Founding member; withdrew July 22, 2021 )
 * Shuna Maru (しゅなまる) (Founding member; Withdrew between late October and November 2021)
 * Ikeda Airu (いけだあいる) (Founding member; Graduated November 7, 2021)
 * Mashiro Mahiro (茉白まひろ) (Founding member; Graduated November 7, 2021)
 * Mizuki Nagito (水月凪叶) (Founding member; Graduated November 7, 2021)
 * Fujimiya Karen (藤宮かれん) (Joined July 19, 2021 ; Graduated November 12, 2021)