Married woman Hana works as a securities sales representative. One day, she visits a client's home to apologize for her subordinate's mistake. There, she discovers that her husband has a major contract with the wealthy client, shocking her deeply. Wanting to resolve the issue quietly, Hana finds herself verbally abused by the client's brother on the spot, causing her to react instinctively and expose her body. Her compromising state is recorded on a mobile phone. With no means of resistance, Hana is summoned to the client's house every day, becoming an anal-only sex slave. Thus begins her daily life of anal training and expansion.