Z5-C1

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

The first line-up was announced on July 10, 2021.

They made their stage debut on August 14, 2021 @KANDA SQUARE HALL.

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

Current Members

 * Ogawa Urara (小河うらら) (Joined December 28, 2022)
 * Nishino Rina (西野里菜) (Joined December 28, 2022)
 * Musubi Meru (結める) (Joined December 28, 2022)

Former Members

 * Yajima Mai (矢島舞) (Founding member; Graduated August 25, 2021)
 * Pomu (ぽむ) (Founding member; withdrew some point before September 7, 2021)
 * Mori-chan (もりちゃん) (Founding member; transferred September 19, 2021 )
 * Sengoku Otori (千石囮) (Joined September 19, 2021 ; Contract suspended October 14, 2021)
 * Amai Miyuu (甘猫みゆう) (Founding member; Graduated November 7, 2021)
 * Yui (ゆい) (Founding member; Withdrew between late September and November 2021)
 * Momose Haruka (百瀬はるか) (Joined September 7, 2021 ; Graduated November 12, 2021)
 * Mito Chinami (美藤千波) (Joined September 19, 2021 ; Graduated November 12, 2021)
 * Isshiki Hiyori (一色陽頼) (Joined August 14, 2022)
 * Ichinose Nonoka (一ノ瀬ののか) (Joined August 14, 2022)
 * Inoue Tsumugi (井上紬葵) (Joined August 14, 2022)
 * Miura Juri (三浦樹里) (Joined August 14, 2022)
 * Kosaka Risa (小坂りさ; ) (Joined September 17, 2022)
 * Sakurazawa Kotone (桜沢琴音; ) (Joined September 17, 2022)
 * Shigeta Norika (重田紀果; ) (Joined September 17, 2022)
 * Sorane (そらね; ) (Joined September 17, 2022)
 * Nanase (七瀬; ) (Joined September 17, 2022)
 * Mashiro Momo (真城もも) (Joined October 25, 2022, Graduated November 29, 2022)
 * Saito Hinata (齋藤ひなた) (Joined October 25, 2022, Graduated November 29, 2022)
 * Oto (おと)
 * Kozuki Suzuho (上月涼歩)
 * Hikaru (ひかる; ) (Joined August 14, 2022)
 * Mizuno Seira (水野青空) (Joined October 25, 2022, Graduated December 28, 2022)
 * Mori Rei (森レイ)
 * Aoba (あおば) (Joined December 28, 2022)
 * Yuki (ゆき) (Joined December 28, 2022)