Asahi Serizawa is one of the new girls available in THE iDOLM@STER: Shiny Colors https://www.project-imas.com/wiki/Asahi_Serizawa
As a cross check, Asahi Serizawa isn't listed as a member of Cinderella Girls https://www.project-imas.com/wiki/THE_iDOLM@STER:_Cinderella_Girls#Character_Type