Read Okane ga nai Manga:
Ayase Yukiya is a university student whose cousin Tetsuo Ishii betrays him and sells him in an auction to settle his heavy debts. Ayase is bought by Somuku Kanou for 1.2 billion yen. The reason behind Kanou doing this is Kanou remembers Ayase from four years ago, when Ayase, a stranger, helped him. Now Kanou wants to keep Ayase close to him in order to protect him, and uses the 1.2 billion debt to force Ayase t more.. o live with him. As Ayase is still a student and does not have a job, he is forced to sell his body to Kanou for 500 000 yen a time.