A husband always calls his wife Aoi on the way home to tell her exactly when he will arrive. He never realizes she is using those updates to time an affair with his boss, squeezing in sex during the final hour and counting down the last 20 or 15 minutes. Such narrow windows invite mistakes. One day he finds a pair of men’s underwear on the floor that does not belong to him, exposing the risk behind their hurried, partially dressed encounters.