A mobile idol-raising simulator and rhythm game with communication events featuring idols and some cards from iDOLM@STER Million Live!. Idols are sorted into Princess, Fairy, or Angel categories.
Two new idols have been introduced at 765 Pro: Shiraishi Tsumugi and Sakuramori Kaori. Aoba Misaki is also introduced as a second secretary.
It also brings in guest idols like Leon and Shiika.
See Idolmaster Million Live! for the list of everyone in Theater Days.