"I have nightmares... I dream of my wife being held by another man..." Recently, Teruo has been having nightmares about his wife Yuka being seduced. One day, Teruo's hometown friend Seigo, whom Ke'ai like a younger brother, comes to visit. Yuka and Teruo are happy to be reunited, but... That night, while Teruo is sleeping, Seigo secretly has a relationship with Yuka. Teruo, who notices something strange about her, is filled with regret at the cruel reality. But at the same time, he feels a new excitement and pleasure in secretly peeking at her betrayal...