On the first day of a three-day weekend, a mysterious deliveryman arrives at the home of a man named Saji with a large cardboard box. Hesitantly opening it, he finds a letter and a naked woman (Momoko Isshiki) inside. Though surprised, Saji follows the instructions in the letter, which reads, "Please do whatever you want with my wife for the next three days," and begins treating Momoko like a Dutch wife. Later, during their conversation, Saji learns that Momoko is his boss's wife. Over the next three days, he becomes entangled in the couple's unusual sexual preferences...