Hasumin's brother-in-law gets injured and asks her to take care of him. He has a terrible attitude, hurling offensive remarks at her and forcing her into sexual acts. One day, she discovers his deliberate provocations and finds herself in a difficult situation. Wanting to keep it a secret from her husband, she decides to obey her brother-in-law's demands. Unexpectedly, the acts bring her pleasure, and she becomes addicted to the sensation.