Z3-B1

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

The first line-up was announced on August 14, 2022.

Current Members

 * Harukaze Rina (春風りな; ) (Joined August 15, 2023)
 * Amuro Kotori (安室ことり; ) (Joined August 15, 2023)
 * Hashimoto Yuna (橋本ゆな) (Joined August 15, 2023)
 * Amatsuka Mio (天使みお; ) (Joined July 2023)
 * Ide Ryoko (井出涼子; ) (Joined August 15, 2023)

Former Members

 * Kanzaki Chisato (神崎千聖) (Founding Member)
 * Momoa Mahiro (桃愛まひろ) (Founding Member)
 * Yoshida Momo (吉田桃; ) (Founding Member)
 * Sorane Kokomi (空音ここみ; ) (Founding Member)
 * Yamine Nemu (矢峰ねむ; (Joined October 25, 2022)
 * Inoue Tsumugi (井上紬葵; ) (Joined October 25, 2022)
 * Umesaki Risa (梅咲りさ; ) (Joined October 25, 2022)
 * Minazuki Reine (水無月黎音; ) (Joined September 17, 2022)
 * Momoa Mahiro (桃愛まひろ; ) (Joined October 25, 2022)
 * Shichinohe Asami (七戸あさみ; ) (Joined October 25, 2022)
 * Tomoka (朋華; ) (Joined October 25, 2022)
 * Hanamiya Ayaka (花宮あやか; ) (Joined September 17, 2022)
 * Hoshino Himari (星乃ひまり; ) (Joined September 17, 2022)
 * Yukina Yuki (雪名ゆき; ) (Joined October 25, 2022)
 * Aito Sakura (愛桃さくら; ) (Joined November 29, 2022)
 * Kiri (きり; ) (Joined December 28, 2022)
 * Yamada Nao (山田菜緒; ) (Joined December 28, 2022)
 * Suzu-chan (すずちゃん; ) (Joined December 28, 2022)
 * Wakamiya Yuriko (若宮ゆりこ; (Joined December 28, 2022)
 * Uyugu (うゆぐ; ) (Joined January 14, 2023)
 * Kisumi Megu (姫菫めぐ) (Joined May 24, 2023)
 * Hanamaru Yuzu (花円柚羽) (Joined May 24, 2023)
 * Tsukimi Seri (月見セリ) (Joined May 24, 2023)
 * Natsuno Suzuka (夏乃すずか) (Joined May 24, 2023)
 * Fuefuki Neko (笛吹ねこ) (Joined May 24, 2023)
 * Aino Momo (愛乃もも; ) (Founding Member, Re-Joined December 28, 2022 & July 2023)
 * Kotoha (ｺﾄﾊ) (Joined July 2023)
 * Sakura Hono (佐倉帆乃) (Joined July 2023)
 * Tachibana Ami (立花あみ) (Joined July 2023)