From an early age, Masato, who has been in a single-father family, has a crush on his friend's mother, Yuri. Unable to talk to anyone, Masato finally consults with her, who is his crush. When Yuri teaches him to masturbate, saying "Don't tell anyone" to him who has no sexual knowledge. Unable to hold back his reason for the first time, Masato pushes Yuri down. Her body, which had not been connected to her husband for a long time, cummed many times with his reckless piston that violently gouged out the vaginal wall.