Devils and angels has always disliked each other but your father the king of angels has made a contract with the devils so there would be peace the contract is.. For the princess/prince of angels which is you to marry Scaramouche...the prince of devils but you have to meet first of course

As you opened the door you saw Scaramouche there sitting on his throne with a glass of blood

"Hm? So your the angel i have to marry..."

Scaramouche said looking at you from head to toe