Yuuya is an orphan, university student who works part-time at a gay bar. He is deceived by a friend and now he has to pay for a loan that he didn't spent. That's when a regular client saves him from the debt collector and pays off his debt but now, Yuuya has to be Saki's sex partner to pay off his debt. Just to add one more problem to this mess, Saki is nothing less than the head of a Yakuza group.
Yakuza-sama no Omocha