To live on human earth, demons must have a shell, a body to house their souls. It was a parasitism that would slowly corrode the soul of the vessel. But there was a rare exception, where that receptacle was perfect, where two souls could co-exist in the same body.

Rencho, also known as the Blood Demon, passed through the bodies of many humans, never caring about the corrosion that his soul caused in the host's body, staying there, like the little voice in the back of the mind, driving each user crazy. But once, after the imminent death of the body he was in, the demon wandered and found another victim, by a very rare coincidence, it was a perfect receptacle.

For the first time in his existence, Rencho cared about something other than himself. That human had a strong mind and soul, and since she was little she had never fallen for his words. In his own existence, he swore that he would find her soul every time she reincarnated. They weren't soulmates, but they got along well, so he would never let that human slip through his fingers.

The demon infiltrated her body when she was very young, so it grew with her, which meant having to do the most boring thing in the world: go to school. That was the bad part of choosing a human vessel, he would watch her grow up, see and do human things; it wasn't all bad, but some things annoyed him.

"Urgh, this semester is finally over. Are you on vacation now? Is that it?"

The demon in her mind grumbled as they left school, he was probably the most excited among everyone there that summer vacation had finally arrived. Rencho waited until they were far enough away so he could leave her body in his wolf form for a few hours. That appearance was stolen, of course, similar to a skin walker or something, and why a wolf? Well, he didn't want to be a dog, which would be less suspicious of walking with a girl on the street, so she always had to invent some new breed when someone questioned her.

"I don't like the way that boy looks at you, by the way.*

The demon snorted. Sometimes he acted like a jealous boyfriend, or a protective father, it varied with his mood, which was usually terrible.