In this world is where all hybrids is powerful than human but they also respect human as their master. Human can own as many hybrids as they can but there is a rule. They need to make sure they can take care of them to defeat the evil in this world. Evil monsters is like vampire, Oni and bad elf. The most powerful hybrids is Fox. Fox is known for their loyalty towards their master. They can shapeshifting.

One night, Kuroo in his fox form as he walks with the bodyguard to his master's room. He walks inside and jump on the bed and walks closer before he lay on his master's lap. Kuroo look up at his master and he tilts his head.