Z4-A3

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

The first line-up was announced on November 20, 2021.

They made their stage debut on November 21, 2021 @Ebisu Garden Hall.

The second line-up was announced in March 2022.

Current Members

 * Kanai Yume (金井優芽) (Joined March 2022)
 * Sorane Kokomi (空音ここみ) (Joined March or April 2022)
 * Mizuhata Marina (水畑まりな) (Joined March or April 2022)

Former Members

 * Ari-chan (ありちゃん) (Founding member)
 * Ichinose Rio (一ノ瀬りお) (Founding member)
 * Shichinohe Asami (七戸あさみ) (Founding member)
 * Nakano Karen (中野華恋) (Founding member)
 * maasa (Founding member)
 * Azuma Mashiro (東茉白) (Joined March 2022)
 * Anekawa Tororo (姉川とろろ) (Joined March 2022)
 * Himemiya (ひめみや) (Joined March 2022)