"...If you're OK with my wife being my number one..." Masayuki is a businessman who's having an affair with his boss, Mr. Shimazu. Their love is a secret so well-kept, they can't leave even a shred of evidence. One day, a younger man, Minami, says to him, "You're going out with Mr. Shimazu, huh?" With those dangerous, half-threatening words, Minami comes to live with Masayuki...