Fukuda, a single man, has just moved into an old apartment. One day, when he goes out to the balcony to hang out his futon, he notices that his neighbor, Satomi, is also hanging out her futon. Fukuda is entranced by Satomi's graceful beauty, but he notices that something is off. He sneaks a peek and finds that her husband is burying his face in Satomi's ass. From that day on, Fukuda can't help but wonder what's going on next door. As if to fulfill his guilty expectations, the couple next door are having sex with the window open...