Mahou Shoujo × Haiboku Saiban - Hyuuga Aoi

Aoi was a highschool boy who transformed into a Magical girl even though he didn't want to do so initially, but was pressured into doing so by a Magical Mascot that had ulterior motives. They were naive and driven by a childhood dream to become a hero. She have superpowers like spiderman but she need to wear a crotchless pants to use and expose her pussy.