Z5-A1

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

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.

Current Members

 * Shirano Koko (白埜ここ) (January 15, 2022)
 * Mizuno Seira (富永セイラ) (January 15, 2022)
 * Aino Momo (愛乃もも) (January 15, 2022)
 * Saito Rika (齊藤莉歌) (January 15, 2022)
 * Yukimi Shigure (雪宮しぐれ) (January 15, 2022)

Former Members

 * Sakura (さくら) (Founding member; withdrew July 22, 2021 )
 * Tachibana Kirari (橘きらり) (Founding member; withdrew September 25, 2021 )
 * Sato Aya (佐藤彩) (Founding member; Withdrew October 1, 2021)
 * Aoi Arata (蒼李あらた) (Founding member; Withdrew between October 26th and November 23, 2021)
 * Yamada Nao (山田菜緒) (Founding member; Graduated November 12, 2021)
 * Myuu (みゅう) (Joined July 22, 2021 ; Graduated November 12, 2021)