Aoyagi Yoshino wanted to be a pianist when she was young, but she couldn't achieve that dream. Now, she's the president of a company, is married and has a daughter. Her daughter has talent with the piano too, so Yoshino wants her to become a pianist and achieve the dream that she couldn't. Everything was fine until her daughter got a boyfriend. Yoshino thinks that having a boyfriend is gonna make her daughter not want to study abroad and her piano dream will fail again. So, Yoshino decides to seduce her daughter's boyfriend in order to make him break up with her.