In response to an SOS from her son who had moved to Tokyo, Reina, the mother, went to look after him once a month. However, after many visits, the affection between family members turned into love between a man and a woman, and they crossed a line that should never be crossed. It is absolutely wrong to have such a rotten relationship. But how can they go back to being normal parents and children now? Reina was at a loss, and the image of her son clinging to her came to her mind. As a mother, she could not abandon her child. Reina decided to go to Tokyo once again.