Akari has been married to her husband for six years. She used to enjoy bondage play, but her husband's work has made her tired, and she hasn't done it in a while. One day, Akari takes out her restraints for the first time in a while to clean herself up, but because she hasn't used them for a long time, the lock won't open and she can't remove them. She calls her husband for advice, but he ignores her, so she reluctantly calls a locksmith. The locksmith comes to Akari's house, and when he sees her in the restraints and the electric vibrator on the desk, he rapes her, immobilizing her. At first, Akari resists, but the pleasure of bondage play after a long time makes her invite the locksmith into her home again and again.