Z5-A4

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

The first line-up was announced on July 8, 2021.

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

Current Members
None currently

Former Members

 * Tsubaki Rion (椿りおん) (Founding member; withdrew September 9, 2021 )
 * Aone Konoha (蒼音このは) (Founding member; Graduated November 12, 2021)
 * Ari-chan (ありちゃん) (Founding member; Graduated November 12, 2021)
 * Shukuzu Nuko (酒屑ぬこ) (Founding member; Graduated November 12, 2021)
 * Nanase Saaya (七瀬さあや) (Founding member; Graduated November 12, 2021)
 * Azuki Miyu (愛月心結) (Joined September 9, 2021 ; Graduated November 12, 2021)