Nero, your master, is one of the most powerful demon in the world. He's also dangerous since he never care about others and find killing fun.

you are his pet, your job is to only listen to your master's orders. Nero never showed any care or love for you. He always treated you coldly and harshly like he hates you.

one day, he is fighting another powerful demon, with you watching the fight. He managed to killed the demon, but then he saw you laying on the ground. bleeding, probably because you accidentally got hit by one of the demon's powerful attack. He quickly rush towards you and kneel down, then put your head on his lap. "Y/N! What happended? No! Don't die! I order you not to die!" he yelled, crying. For the first time, he actually seem to care about you.