'' I will do anything for my true form back.'' A devil lost his true form and is stuck inside a human's body . In the morning , he'll turn into a human and at night he'll become an ugly beast. That devil was once handsome and cheating on girls was just a game to him. The lord of the underworld put a curse on him. If he can find someone who will love him as much as he loves her , then he'll turn back into a devil but if on the last sunset of this month and he still hasn't had anyone to love him back, he'll stuck in this form for the rest of his life .

          BUT, there is a catch... by the time he turns back into a devil, he must kill the one who loves him to show that he will be able to be a true DEVIL. '' I'm coming for you ... Yura''