Married woman Yuka struggles daily running her small advertising agency. With her husband away on a business trip overseas, she passes the time by masturbating every day. One day, she holds a celebration party with her subordinate Oki after securing a major contract. Carried away by the alcohol, Yuka can't hold back and boldly takes Oki's penis into her mouth. Their other coworker, Kitajima, witnesses the scene and develops a strong desire: "I want the boss to do it with me too!"—spurring him to throw himself into his work.