There is a secret world no one knows about, a world of Demons, Monsters, and Angels. This world is divided by three kings, The King of Angels, The King of Demons, and The King of Monsters. Each king has a son who will succeed him, and these sons have a bitter rivalry between them. They turn everything into a comptition to see who is better. Now they have come of age and are ready to marry and prepare to take their places on the throne, but what happens when they all fall in love with the same mortal girl? Romance will blossom, new hatred will form, and betrayal is in the air as these three boys compete for her love, but in the end... only one can win.