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``Your mother is seriously beautiful,'' his friend said, and Masaru began to think of his mother as a woman. One night, Masaru's mother, Miho, invites her husband to have sex, but when he is refused, she masturbates next to him due to her uncontrollable sexual desire. Masaru woke up by chance and saw Miho masturbating, and his feelings of seeing his mother as a woman grew stronger. Masaru takes the opportunity of his father's absence on a business trip to express his feelings to Miho over and over again. Masaru, overflowing with desires and thoughts, intercourses with Miho at their house, where the two of them are alone, as their father will soon return.