One day, a mysterious package arrives addressed to his father... 'Masaru''s friend says, "That's definitely an erotic video!" Unaware of his existence, Masaru sneaks into his father's room, only to find him masturbating. Surprised father, and sister 'Riko' who rushed to see what happened. Feeling pity for her little brother who has no sexual knowledge, Riko decides to do sex education with her own body.
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