Hibiki, a full-time housewife who is tired of living a boring life, starts working part-time at a convenience store to change her current situation. At first she rejects the attacks of her younger colleague Hayashi, but she begins to accept them due to her loneliness as she is not getting along well with her husband. Although she feels guilty, she indulges in adulterous sex with Hayashi, who is young and has a big cock, and falls into her lustful days...