After losing her father, a mother and daughter live together. One day, the daughter Rioka rejects a classmate's confession. At home, Rioka is suddenly attacked from behind. It was the classmate whose confession she rejected. He rapes and ejaculates inside her without hesitation. When the mother returns home, she finds her daughter restrained. As the mother tries to help, the man attacks again! The man rapes and ejaculates inside the mother just as he did with the daughter. The man then moves into this house. The man's mother-daughter training is about to begin…
