Of the three families with unhuman power and influence, Saint Beryl must sort out the Devil. Only her divinity can tell who the demon is.

'Who Will You Marry?'

To escape the previous two hellish lives, Beryl chooses a real demon, the Duke of Vine. To survive a cruel death, and perhaps he could get a brutal revenge on those who killed him.

That's how Beryl entered the devil's castle.
Beryl, who had only learned to control her desires in the temple, you learn to truly desire the irreverent and sweet demon Baine...!