Aimi and Takashi were mother and daughter, but at school they were also teacher and student. Aimi thought that their relationship should be clear in front of the other students, so she was especially strict with Takashi at school. But when they got home... Aimi-sensei was a sadist at school, but at home she was a Aimi mom who let him indulge in her. The parent-child relationship, which is both sadistic and masochistic, continues today.