Kimi to Warui Koto ga Shitai

Mamori Wataya has always been overlooked at school, and she has accepted her place as a quiet supporting character. That begins to change when she befriends Soushi Fuji, a brusque classmate who walks with a cane and is unconcerned when others underestimate him. Fuji encourages Mamori to embrace her “bad” side and become a lowlife like him. When he asks her to drain the school pool, she gets her first thrill from breaking the rules, inspired by the villains she admires in anime and manga. Though she is willing to try being a little naughty, Mamori realizes she may not be ready for truly awful deeds.