Z4-A3

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

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

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

The second line-up was announced in March 2022.

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

Current Members

 * Aise Uru (逢瀬愛瑠; ) (Joined December 28, 2022)
 * Kusaka Hiiro (日下緋彩; ) (Joined December 28, 2022)
 * Sakaguchi Kotone (坂口琴音) (Joined March 6, 2023)
 * Haruka (陽香; ) (Joined December 28, 2022)
 * Watanabe Suzu (渡辺すず) (Joined March 6, 2023)

Former Members

 * Ari-chan (ありちゃん) (Founding member)
 * Ichinose Rio (一ノ瀬りお) (Founding member, Graduated February 23, 2022)
 * Shichinohe Asami (七戸あさみ) (Founding member)
 * Nakano Karen (中野華恋) (Founding member)
 * maasa (Founding member)
 * Azuma Mashiro (東茉白) (Joined March 2022)
 * Anekawa Tororo (姉川とろろ) (Joined March 2022)
 * Himemiya (ひめみや) (Joined March 2022)
 * Nagisa (なぎさ) (Joined May 2022)
 * Mizuhata Marina (水畑まりな) (Joined March or April 2022)
 * Minazuki Reine (水無月黎音) (Joined May 2022)
 * Kanai Yume (金井優芽) (Joined March 2022)
 * Sorane Kokomi (空音ここみ) (Joined March or April 2022)
 * Maria (まりあ) (Joined June 2022)
 * Kumayuri (くまゆり) (Joined July 2022)
 * Fuka (颯奏) (Joined August 14, 2022)
 * Nanaka (ななか) (Joined August 14, 2022)
 * Ito Nazuna (伊東なずな) (Joined July 2022)
 * Nishimura Himeno (西村姫乃) (Joined June 2022)
 * Miyamoto Airi (宮本愛莉) (Joined June 2022)
 * Tomoka (朋華; ) (Joined June 2022)
 * Misaki Rikka (みさきりっか; ) (Joined September 2022)
 * Mihoshi Yuno (海星ゆの; ) (Joined September 2022)
 * Aisaka Yuuna (逢坂ゆうな; ) (Joined September 2022)
 * Usami Seina (宇参星恋; ) (Joined August 14, 2022)
 * Kayano Izumi (茅野伊澄; ) (Joined September 17, 2022)
 * Kokeshi (こけし; ) (Joined October 25, 2022)
 * Suzuki Motoko (鈴木素子; ) (Joined October 25, 2022)
 * Mikuriya Kureha (御厨紅遥; ) (Joined October 25, 2022)
 * Sakaguchi Kotone (坂口琴音; ) (Joined October 25, 2022, Graduated December 28, 2022)
 * Rukino (るきの) (Joined November 29, 2022)
 * YURI (Joined November 29, 2022)
 * Yozuki Ayu (夜月あゆ; ) (Joined November 29, 2022)
 * Aisaka Yuuna (逢坂ゆうな; ) (Joined November 29, 2022)
 * Enomoto Aoi (榎本葵; ) (Joined December 28, 2022)
 * Hinami Mira (日南心良; ) (Joined December 28, 2022)