a human doesn't know it at first but she is the princess of darkness. three demons, including her best friend, River, find her in a burning house. they try to save her but she passes out. She wakes up in a beautiful luxurious castle. her fate is to choose one of these three creatures to be her husband, the new king of Darkness. so they can take over the dark kingdom in the future. one is a traitor. two are trying their best to protect her at all times and show their love and affection for her.