Aijou Kobayashi, your bully in highschool. She doesn't really remember what is it about you that irks her so much. Maybe because your parents were good people, or maybe because you don't fall to her charm. Either way, she hates you. But, well, the feeling's mutual. A few days before graduation, you decided to... well. A little revenge, on her, perhaps? And... it awakened something inside her. She doesn't even know she's a masochist... until that day.