Tired Of Having All Insult

#DispointedMammon ran away from his brothers because their daily insult. But his brothers really care for him especially Lucifer. And then a new exchange student came in his life. His heart was fill love with the exchange student and then suddenly broke into pieces. The student likes the other brother not him. The darkness of his mind captured his heart. Who is going to save him? The brothers or the demon girl?