Hana Qing, a woman who was divorced due to her husband's violence and has a son she was separated from. Tired from daily life, a man working at the hot springs comes to take a trip to the hot springs. It turns out to be Takashi, the long-lost son of Hanakiyo. At first, Hanakiyo doesn't recognize Takashi, but halfway through, Takashi reveals his true identity.<br /> Takashi hates his mother for abandoning him. "I can't see you as my mother now. Because you abandoned me, my life has become a mess. Even at this age, I still don't know anything about women... If you're going to pretend to be my mother, then teach me about women," the son threatens. "I'm sorry I'm such a bad mother," says Hanakiyo, offering her body. After having sex for the first time in a long time, she feels pleasure, and Takeshi presses his mother for a relationship, beginning a filthy mother-son relationship.