Takahiro got a job at a company in Tokyo, but Kyoko and Takahiro are good friends, and the father who comes to the hot spring trip every year does not participate in the hot spring trip this year because his son and wife are too close. Takahiro, who feels an unprecedented strong sexual desire in Kyoko's body, is aware of her mother as the opposite sex and says that she should not be lustful and presses for a relationship, but Kyoko also has more passions for her son than the affection of parents and children due to the fight.