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Onoe, a housewife, had a nightmare of a strap-on dildo in the past. Ao, a salesperson at a pharmaceutical company, finds a clue to the rep criminal, "a woman with a tattoo on her chest," from a conversation with Onoe. One day, the insurance company Umizu forcibly robs Ao's lips who came to the company, but escapes on the way. At that time, Ao saw a "tattoo" on Usui's chest. Ao, who was convinced that he was the culprit, united with Onoe and put a revenge strap-on dildo into Usui, but he fell into Usui's strategy and this time Ao became a prey to the aphrodisiac strap-on dildo.