Ueda, who went to stay the night at his friend's house, had long fallen in love with the beauty of his friend's mother, Ichika, and before he knew it, his desire to meet her had grown stronger than just a casual encounter. One night, Ueda happened to witness Ichika masturbating while talking on the phone with her lover. Exposing her shameful behavior, Ichika begs Ueda to keep it a secret, but Ueda, unable to suppress his urges after seeing her in such a lewd state, offers Ichika a condition: if she doesn't want her affair to be exposed... Then, a few days later...