My Cute Crossdresser (Hentai Manga)

What happens when a bunch of nerdy guys (without girlfriends) get together to try to catch a perverted predator on a crowded train - and decide to run a sting operation? But, how would they do that? Who or what would they use for a decoy to catch this predator? Oh, we know! Let's dress up one as a girl! Yes - HE is a SHE! He looks so cute! He's just perfect and anyone would fall for him! Including his classmates!