My Dress-up Darling 3 is an English-language manga for adults.

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A loner boy and a flashy girl find common ground via cosplay in this sweet and spicy romcom!

Wakana and Marin make it through their very first cosplay event, and not long after, Marin's heart undergoes a change…?! But that's not going to stop her cosplaying! To research their next project, the duo decide to watch the anime it's based on…but on screening night, they wind up alone together…?! And with JuJu, another gorgeous cosplayer, dropping by Wakana's house…it seems like a love triangle is abrew!