Mino and Sakura are colleagues. During a company party, Sakura got drunk and fell asleep. Seeing this, Mino took Sakura home and took care of him. Sakura was touched by Mino's kindness and continuously confessed his feelings to Mino. At first, Mino rejected him, but moved by Sakura's persistence, Mino eventually agreed. Sakura's parents also wanted them to marry and have children soon, so Mino agreed to have a wedding and stay home to bear children for her husband. She was unaware that their director had been watching Mino for a long time. The moment she went for an interview, he took notice and placed her in the position of secretary to gradually make Mino his. But before he could 'make a move', she was already preparing to get married. 'But isn't it more interesting to take someone else's woman?' So he placed Sakura in charge of a project, then used his connections to make her fail and end up in massive debt. And he used that debt to force Mino to be his "mistress", in return for him to pay the debt on her husband's behalf. At first, Mino agreed just because she wanted to save her husband. But gradually, the feeling of pleasure when having sex that the director gave her made her gradually unable to stop. She wanted to fuck the director more, and the two even fucked each other even when her husband was working outside the office...