Z4-A1

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

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

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

Current Members

 * Mito Chinami (美藤千波) (Founding member)
 * Yamada Nao (山田菜緒) (Founding member)
 * Kusunoki Anzu (楠あんず) (Founding member)
 * Harada Yukika (原田ゆきか) (Founding member)