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Yuichi suffers from his unforgivable love for his mother-in-law Saya. Saya, who sensed his son's feelings, allowed him to peek at the masturbation act, saying, "If it's up to this point...". However, young Yuichi can't stand it alone, and he attacks Saya. However, at the same time, her father, who was at home, suddenly began to suffer and died. After 49 days, Yuichi continues to have a relationship with Saya, even though he feels guilty about his late father, but an unexpected person calls out to him.