The other idols included in the Seibuen Amusement Park “Retro Fes” collab have been revealed!

765AS: Yukiho, Makoto, Haruka, Azusa, Takane
Cinderella Girls: Hasumi, Ranko, Yuuki, Shin, Karen
Million Live!: Konomi, Megumi, Kotoha, Serika, Rio
SideM: Asselin, Kirio, Pierre, Natsuki, Ren