Meek, self-doubting Rina has just one real friend, Koto, and a controlling boyfriend who treats her like a toy. When Koto introduces her to her beloved young single dad, Naoto, Rina recognizes him as the man she’d secretly filmed buying sex from schoolgirls, and behind Koto’s back she throws herself at him. He resists bedding his daughter’s friend but soon gives in, freeing Rina from her abusive boyfriend and showing her a gentleness she’s never known.