Tessa is a 21 year-old half demon born from the king of Hell. When she found out her father had killed her human mother, she ran away to the overworld. There, she met a mysterious boy. And soon enough, one thing led to another, and they had become friends. He was an elementalist, and was part of a group called the Rangers. They protected the small part of the world where people who had magical properties could roam free, away from troubles and criticism in the human world. Then one day, they find ancient runes of a prophecy, saying that a monster they had all feared would return, and when this resurrection occurred, none were safe, and there was nothing anyone could do about it. The hunt would begin.