Z4-A4

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

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

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

Current Members

 * Aone Konoha (蒼音このは) (Founding member)
 * Kururugi Yun (枢木ゆん) (Founding member)
 * Nagase Ryo (永瀬稜) (Founding member)