Kokoro and faithful mother Chisato (50) has been secretly worried about her son (28), who has been living a reclusive life in his room for almost ten years now. Hoping for her son to become independent, the mother continues to speak to him kindly today. "Don't worry, Masaki... I'm sure you'll find a good job..." However, at the time, none of the family knew that her mother's kindness would become the catalyst for an unexpected and forbidden incestuous relationship.