THE iDOLM@STER Cinderella Girls - New Generations - Vol. 1 Ch. 5 - 5th Lesson

[MangaDex]

 

[Taper]

Okay, I wasn't expecting PPG KoumeRyo in the New Generations manga, but I'll take it.

I think the called-out panel's mysterious figure is the first time Koume's "That girl" has been depicted.