"What would you do if the person you were destined to love stood right in front of you, and they were the only one you were forbidden to touch?" When a mysterious boy shows up at Aira's school, she has no idea she's about to fall in love with an angelic being who was destined to find her, and that they would have to take on the Darkness not only to save their immortal love but the entire well-being of human existence.