"The condition of our agreement will be the exchange of our bodies--", after being saved from a tight spot by her sadistic kouhai Dousaka, all the judo manager Sakura can do is listen to what he says...

Asuka, who lived in Hokkaido with her mother, moves to Tokyo to look for her father she has never even met before. When she gets to his house, he is not there, only his children, who claim they have never met...