Natsumi HORIGUCHI Retired, wife of the Waisetsuji train

While Shinjo's teacher, Natsumi gained great trust from his strict guidance policy, he was displeased by the unfaithful student Takatsuki and his friends. At one point, Natsumi was hit by a jealousy on the train and could not resist from fear and was humiliated. Furthermore, some of them were witnessed by Takatsuki. Takatsuki invites his friends, threatens Natsumi, and tries to be ashamed as possible of shame. A few days later, Takatsuki and his colleagues, who were still uneasy, surrounded Natsumi on the train.