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.

The second line-up was announced on January 9, 2022 and debuted on January 15, 2022.

The third line-up was announced in March 2022.

Current Members

 * Kayano Izumi (茅野伊澄) (Joined March or April 2022)
 * Shiun Shino (紫雲しの) (Joined March or April 2022)
 * Shigeta Norika (重田紀果) (Joined March or April 2022)

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)
 * Aoi Rui (蒼井ルイ) (Joined January 15, 2022)
 * Asakura Yuzuki (浅桜ゆづき) (Joined January 15, 2022)
 * Ikeda Haruki (池田遥希) (Joined January 15, 2022)
 * Nagahime Miku (長姫未來) (Joined January 15, 2022)
 * Yuki Sena (結城星奈) (Joined January 15, 2022)
 * Uyugu (うゆぐ) (Joined March 2022)
 * Kanraku Momo (柑楽モモ) (Joined March 2022)
 * Ten (天) (Joined March 2022)
 * Risa-nyan (りさにゃん) (Joined March 2022)