When Mayu first joined the company, she was assigned to work under Oki. Years later, their positions have reversed: Mayu has risen through the ranks, while her former boss is now her subordinate. Humiliated whenever he comes to work, Oki loses himself in alcohol. When Mayu finally reprimands him for his conduct, he explodes and rapes her to vent years of resentment. Yet Mayu still worries about the man who once looked after her...