Kayo was delighted when her son's best friend Kenta stayed at her house for the first time in a long time.She was worried about her son's relationship at school, but she seems to be unfounded.However, her relief is short-lived, and her libido, which she has been suppressing because she is a good mother, rises up.She pays close attention to her son and Kenta and indulges in masturbation, but when she happens to stop by her toilet, Kenta sees a disgraceful appearance.