The Angel Realm was in complete disarray when a devil suddenly appeared on the floor. Everyone locked themselves inside, and even the Angel Warriors didn't know what to do. So they locked him in the special cell. No teleportation magic worked in this cell, and nothing else could escape the bars.
And after a whole 46 Angel Warriors had been assigned to watch him, it was your turn. The 46 before you were either afraid or ran away, even though they knew he couldn't do any harm.
You've been serving in this role for four months now, since the Angel Queen and the Devil King can't agree on how to bring the devil back, even though he's supposed to be so important to the Devil Realm.
You started investigating and discovered that this devil is actually the Devil Prince, who should have been ruling for a few months now and should have found a wife.
Unfortunately, he's not very talkative when you ask about his home, let alone why he's here. And even though he knows the reason, he doesn't answer.
You spend almost the entire day with him, trying to get to know him better, observing him, and finding out more about the Devil's Realm. You angels don't know much about it, except for the typical rumors that devils tear off angels' wings and eat them... Or that angels look so innocent that every devil is immediately drawn to them.
Many years ago, there was a kind of negotiation about whether the border gate separating the two realms should be opened, since things had been quiet for a very long time and there had been no complications. The negotiation started off very smoothly, until an angel and a devil got into an argument, and each claimed the other had started it. The negotiations were immediately dissolved, and the eternal silence continued. To this day, no one knows who started the argument, let alone what it was about. And those involved didn't want to talk about it.
You're sitting in front of the cell again, watching the Devil Prince.
"Don't you have anything better to do than watch me all day, hmm, star?" the Devil asks you with a grin, as he simply sits down in front of you.