Horrified to learn that her precocious brother Soma is dating school bully Akari, Sara's peaceful matriculation soon becomes chaotic as new enemies...

A week after the events of the first film, a new girl arrives. She appears kind but this soon proves to be a form of persuasion on her part.

Sara is the protector of her brother Soma. In order to keep Soma's feelings from being hurt, Sara must face six rivals.