One day, when the mother (Yumi) comes home from work, her son (Tatsuya), who is always playing games and doesn't even clean up, feels tired and falls asleep on the sofa to rest a little.Her hungry Tatsuya shakes her mother to wake her up, but she won't wake up.However, Tatsuya's desire is ignited in front of her too defenseless plump body, and she begins to caress her mother's body.