Debt Sisters / Shakkin Shimai

Kasumi works as a teacher at a private educational organization. One day, a stranger comes to her and demands to repay her father's debt. He is trying to persuade the main character to unacceptable actions.

One of her students named Okura comes to Kasumi's aid. He drives away an unpleasant guest. Okura offers his mentor money to pay off the debt, but Kasumi refuses.

Okura is afraid of the possible consequences and does not want Kasumi to become a victim of fraudsters. Therefore, he offers her a deal: he is ready to buy her and pay money for an intimate relationship with him.