Runa Satsuki

Sora's senior at school. Ever since being forced to walk home from school only wearing her school swimsuit, she's been an exhibitionist. Sora first meets her as she was changing bare in the elevator at their apartment complex. She mistakenly thinks Sora finds cross-dressing exciting. She later forces Sora on a "fetish" date with her - she's wearing only a raincoat, and he's in drag - and forces him to masturbate to her masturbating, and in chapter 6, she tricks Sora into going to a sex orgy with her, as her pretend-boyfriend. It is unknown whether she has any feelings for Sora, however she has stated that it is only "good" if he is the one to see her naked.