Z4-D3

 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.

Current Members

 * Shion (詩音) (Joined March 2022)
 * Miyamoto Airi (宮本愛莉) (Joined March 2022)
 * Yamine Nemu (矢峰ねむ) (Joined March or April 2022)

Former Members

 * Mochizuki Ko (望月心桜) (Founding member)
 * Harumi Hina (春海妃花) (Founding member)
 * Takamine Yukina (高峯雪菜) (Founding member)
 * Sawada Nana (澤田なな) (Founding Member, Joined March 2022)
 * Hazuki Rio (はづきりお) (Joined March 2022)
 * Sato Suzu (佐藤寿々) (Joined March or April 2022)
 * Hachimiya Sara (八宮さら) (Joined March 2022)