100-oku no Otoko

My life... Please buy it for 10 billion! Tatsuya Tomizawa is an ordinary business man when he inherits his mom's 10 billion yen debt. In order to become a 10 billion yen man, he sells himself to Tenzan Kugayama. With stacks of cash and women by his side, he pulls himself up from the edge!

(Source: Shogakukan, translated)