Oda, who is still a virgin, dreamed of having the best experience with the perfect partner—something that would become a lifelong memory. It was then, while visiting a friend's house, that he met Rio, his friend's mother. "She's the one!" Convinced at first sight, Oda couldn't sit still and went to peep on Rio while she was bathing. What he saw was Rio masturbating in the bathroom. Having successfully taken secret photos, Oda plotted to use the images to blackmail Rio into taking his virginity...