Adult PC Game: DropOut Kyonyuu Roshutsu Choukyou Gakuen by Atelier Sakura Archive

Shizuka Saotome was the only enemy in the bad classes with an excellent sense of justice and an all-around athlete in various mixed martial arts Black Belts. Shizuka always discouraged bad behavior. The gang received photos depicting Shizuka in an awkward situation, taken by a voyeur that day. They are blackmailing Shizuka for their own purposes..