Z5-B4

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

The first line-up was announced on July 9, 2021.

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

The second line-up was announced on December 4, 2021.

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

Current Members

 * Otsuki Kokoa (大月心愛) (Joined September 17, 2022)
 * Natsuna Rika (夏菜莉歌) (Joined September 17, 2022)
 * Himekami Ranno (姫上ランノ) (Joined September 17, 2022)
 * Hozumi Merumo (穂積めるも) (Joined September 17, 2022)
 * Mizuri (みずり) (Joined September 17, 2022)

Former Members

 * Mito Chinami (美藤千波) (Founding member; transferred September 19, 2021 )
 * Momo Teyan (ももてゃん) (Founding member; Graduated between October 9th and November 2021)
 * Miru (みる) (Founding member; Graduated between October 20th and November 2021)
 * Kusaka Hiiro (日下緋彩) (Founding member; Graduated November 12, 2021)
 * Yamashita Moe (山下萌) (Founding member; Graduated November 12, 2021)
 * Aiba Chiho (Joined December 4, 2021)
 * Hoshina Fuka (Joined December 4, 2021)
 * Midoriishi Ui (Joined December 4, 2021)
 * Sorano Hina (Joined December 4, 2021)
 * Taketori Runa (Joined December 4, 2021)
 * Aisaka Yuuna (逢坂ゆうな) (Joined July 2022)
 * Hanamaru Yuzu (花円柚羽) (Joined July 2022)
 * Maonyan (まおにゃん) (Joined July 14, 2022)
 * Maru (まる) (Joined July 2022)
 * A-chan (あーちゃん) (Joined July 2022)
 * Asahi Sena (朝日せな) (Joined August 14, 2022)
 * Amano Hinako (天乃ひなこ) (Joined August 14, 2022)
 * Hiiragi Aoi (柊あおい) (Joined August 14, 2022)
 * Ruki (るき) (Joined August 14, 2022)