Hime goes to a doujin event to help Bel-senpai. The popular thing to look out for at doujin events is of course, cosplay... So of course they dress him up, and...

Despite his protests, Hime is forced to appear in a Girls' Contest in a swimsuit to help promote the cultural fair. The student council and public morals committee both participate, and it is there that Kaguya tells Hime something...