Yukine's husband is working away from home and her son has left home, leading a lonely life. One day, bored with her monotonous daily life, Yukine, who is working as a cleaner, meets Yutaka, a young employee at the same company. Yutaka secretly peeks at Yukine as she gets changed in the locker room, and is mesmerized by the glamorous body of the normally modest cleaner. Then, the two, who are a decade apart in age, suddenly become close through an unexpected turn of events. Yukine becomes addicted to the thrill of secretly seeking each other in the office and Yutaka's young, strong body...