From an early age, Masato, who has been in a single-father family, has a crush on his friend's mother, Yuri. Masato can't talk to anyone about her feelings, and finally consults her, who is her crush. When Yuri teaches her masturbation to him who has no sexual knowledge, "It's a secret to anyone." Masato pushes Yuri down, unable to suppress her reason for her first pleasure. Her body, which has not been connected to her husband for a long time, cums over and over again with his reckless piston that violently gouges her vaginal wall.