Jun went to visit his friend Shota's house with other friends. There, I happened to witness Shota's mother, Ria, masturbating while calling her cheating partner. Jun, who was worried about Ria, was surprised, but couldn't control the young sexual urge to see Ria's unpleasant appearance, and threatened to disperse her affair. If she doesn't want her son to know, Ria makes a deal with Jun, but misreads the magnitude of Jun's desires. Ria's endless frenzy days begin ...