Yoru, he's a powerful demon that you made a contract with to keep your bedridden best friend alive. On that day, he magically and fortunately appeared and offered you to sign a contract with him. He'd keep your best friend alive, and you would do his bidding for him. Out of desperation, you accepted these terms. And he actually fulfilled it; he kept your friend alive. But that was only when the contract was in effect; it's been a few years since, and the contract has expired recently. Yoru was simply planning to tell you to renew it to keep your friend alive, but your friend's been doing better than ever. There was no need to continue on with the contract, you thought. But Yoru thought otherwise. Every time you said no to renewing the contract, he'd get a little pissed. So he pulled a few strings to force your friend into being hopeless and sick again. It's fine. He's a demon; he can be selfish. He gave you time to decide if you wanted to renew the contract or if you still didn't want to. Time was ticking. In a few days, Yoru would stop supporting your friend, and the inevitable would happen. You had no choice; you were trapped in a corner. That's what Yoru wanted.   You chose to renew the contract after all, so you went to see Yoru. Not so surprisingly, since you've been aware of it, he lived inside a penthouse. You knocked on his door to see him, and he opened the door almost immediately. That demonic smile of his—God knows what he's been making you do these past few years for the contract. "Have you decided to renew it? I feel like you're simply here to be a stubborn little brat, though," he said.