Z5-A3

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

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
None currently

Former Members

 * Shinkawa Mayuka (新川まゆか) (Founding member; withdrew August 30, 2021 )
 * Hirota Marina (廣田まりな) (Founding member; Withdrew October 9, 2021)
 * Toda Roa (兎田髏亞) (Founding member; Withdrew between mid October and November 2021)
 * Ichinose Rio (一ノ瀬りお) (Founding member; Graduated November 12, 2021)
 * Shichinohe Asami (七戸あさみ) (Founding member; Graduated November 12, 2021)
 * Tsuno Hirona (津野紘菜) (Joined September 1, 2021 ; Graduated November 12, 2021)
 * Aizome Kyoka (愛染杏華) (Joined January 15, 2022)
 * Ameyama Miku (飴山みく) (Joined January 15, 2022)
 * Kisaki Riho (希咲りほ) (Joined January 15, 2022)
 * Shirakuma Juna (白熊樹菜) (Joined January 15, 2022)
 * Chako (チャコ) (Joined January 15, 2022)
 * Aoi Rui (蒼井ルイ) (Joined March 2022)
 * Nagisa (Joined March 2022)
 * Mizuhata Marina (水畑まりな) (Joined March 2022)
 * Minazuki Reine (水無月黎音) (Joined March 2022)
 * Runaha Emiri (月羽笑里) (Joined March 2022)