In her fifth year of marriage, Mao Hamasaki's ordinary life takes a sudden turn. One night, her husband attempts to initiate intimacy with his wife after a long time, only to discover her body on all fours with a crude message scrawled across her buttocks: "This woman is currently cheating on her husband!!! www". Shocked and confused, he stares in disbelief—but she calmly accepts the situation, even deepening the night’s depravity. This affair began a month earlier when Mao was invited to drink at the apartment of two neighboring college students. Intending to have just one drink, she lost consciousness from excessive alcohol, waking up to find herself being intimately touched by one of the men while the other recorded everything on camera. From the next day onward, she became obedient to their commands, living each day as their secret mistress. Now, succumbing to her husband's dominant graffiti, she continues to use her body in this corrupted state. Through this journey, Mao grapples with the pleasure of infidelity, her dependence on her husband, and the inner conflict of her own desires.