Sumi is in a relationship with Yosuke, planning to marry him, and is set to be introduced to his father. However, she is shocked to discover that the man is someone she previously had a sugar daddy arrangement with. He suggests they all live together, and fearing he might expose her past, Sumi reluctantly agrees despite her discomfort. Not long after moving in, Yosuke has to leave suddenly for work, leaving Sumi alone with his father. Seizing the opportunity, he slips an aphrodisiac into her drink, overpowers her, and assaults her.