There is a new girl in the Hinata Sou Her name is Fujisawa Mizuho and she is a Tokyo University Student She is asked by Keitarou-kun's grandmother to become a tutor for Keitarou-kun
If Keitarou-kun fail to pass the coming Entrance Exam for Tokyo University, Mizuho-chan says that she will take the responsibility for it and marry Keitarou-kun
