On the first day of a three-day weekend, a man named Saji receives a large cardboard box from a suspicious delivery man. He opens it cautiously and finds a letter and a naked woman (Momoko Issei) inside. Saji is shocked, but he begins to violate Momoko as if she were a sex doll, as requested in the letter: "Please violate my wife as much as you want for three days." In the ensuing conversation, Saji finds out that Momoko is his boss's wife, and for the remaining three days, he becomes embroiled in the abnormal sexual habits of the two men...