Yukiya Ayase, a 18-year-old college student, is betrayed and sold by his cousin Tetsuo Ishii in an auction to the highest bidder to settle his heavy debts, but then bought by Somuku Kanou for 120 million yen. Kanou does it because he remembers Ayase from 4 years ago, when Ayase helped him as a stranger. In a desperate effort to keep Ayase close to him, Kanou demands the debt be repaid in full and suggests the perfect way to do it: by selling his body to Kanou for 500,000 each time.