Nagisa and Saito have been together for five years. It was meant to be just another date. In a hotel suite, Saito suddenly takes out an engagement ring and proposes to Nagisa. "There's one more important thing I want to tell you," says Saito, a different man than usual. An oppressive atmosphere hangs over the room. Persuaded by Saito's persuasion that "I want you to sleep with other men before we get married," one after another strange men appear in front of Nagisa...