My Dress-Up Darling 07 (manga)

Marin's bestie and Wakana's classmate Nowa might seem a little flaky, but the girl has some serious instinct when love is in the air! When she tosses out a bombshell at karaoke by flatly asking Marin and Wakana if they're an item, it sends the two running!

But before long, it's cosplay over love, as the school culture festival rolls around! To Marin's utter surprise and delight, their school features a unique festival event that means...cosplay at school?! And even though Marin's an old hand at cosplay now, the type of costume the event calls for is all new to her!