His birth will change the fate of the entire dynasty. He is born with the purest blood among demons and powerful magic power. It was his mission to find the patron saint of life and the country. When a catastrophe was approaching, he had to accept this mission, so he embarked on the road to find the patron saint. In order to help him better grasp the laws of the human world, his father sent him to a demon academy, but he didn't know the real horror behind this school... He accidentally met the heroine, but he didn't know her identity. After several twists and turns, he told the heroine all about his life experience, and fell in love with her, but he didn't know that danger was coming. In the end, the heroine fell asleep to protect him, and the country was about to perish. Could it be that the legendary patron saint did not exist, and he would not be able to escape his fate? ? ? ? ? ?