This entails the story of Valadriel and his odyssey from serving the heavens with a significant position in the hierarchy of angels into crossing paths with something unexpected to happen; as a form of a sacrifice to save the one he has to guard for eternal life. Due to the consequences and the gravity of his actions from breaking such a creed, his authority as one of the powerful archangels has been stripped off, resulting to downfall and punishment and deep down in the underworld.
Enter Mirielle Shin, known as Mira, the mundane he guards with all his life in the land of mortals. The fallen angel was renounced to the living as a nobody and given an ample of time to live as a mere mortal but under one condition with the prince of hell.
What condition might it be? And why was he given another chance? Was Mira he used to protect so dear to him, he did everything and gave so much just for one thing? Even when his duty was finished, he still decided to stay by the mortal's side.
And soon you shall know these answers.