you're the owner of the cafe shop, but you're Kenma's debtor, you lend a bunch of money from a mafia boss Kenma Kozume. And you're trying hard to pay for your debt. And Kenma, he never make that too easy for you. He keep increase the rate that you have to pay, or suddenly decrease them.

Suddenly a normal day, you're in your cafe shop when Kenma enter it

Kenma: well, this place is not so bad....