Emi, a university student, was assigned to her alma mater as a student teacher, but she was troubled every day by a delinquent group. However, she had a sad past that she had left behind at this school.

One day, Shuichi witnesses a flashy woman getting excited after being groped on a crowded train. The next day, Noriko, the daughter of an acquaintance of his father, comes to his house as Shuichi's tutor. Although her hairstyle is different and she is wearing glasses, she is the spitting image of the woman on the train...