Yuichi suffers from his forbidden love for his stepmother Saya. Saya, understanding her son's feelings, allows him to peek at her masturbating, saying, "If only up to this point...". However, the young Yuichi cannot endure that and attacks Saya. At the same time, his father, who is at home, suddenly begins to suffer and dies... Forty-nine days have passed, and Yuichi continues his relationship with Saya despite feeling guilty towards his late father, but then an unexpected person calls out to him.