Two sisters, Kaho and Kasumi, are deep in debt due to their now deceased father. Kasumi's student, Okura Hiroyuki, who has a huge crush on her, decides to pay back the entire debt. However, Kasumi refuses to accept the money. Fearing Kasumi will be forced to sell her body to repay the debt, Okura takes matters into his own hands to ensure that Kasumi remains his, and only his...