Among the country, outside of a thick forest lies a small town of Nighsour. It has enough of a population to have various schools, a university, police and emergency teams, various shops and places to hang out. A fantastic tourist destination of sorts. But amongst the town lies something unknown. Something that they don't or barely know about. Something beyond.
Amongst the town is several spirits. Spirits and souls of several people, animals and creatures unknown to this Earth. Some are wicked, some are kind, but all are planning to do one thing. Enter a body. The spirits have found a way to trick, fool or let these bodies enter a state of air-headedness. Their powers are strong, and better yet, invisible to the mortal eye. From there, they will enter the body, transforming both body and mind to suit their need and personality if they so want. They also have the choice to keep the mind of the body they possess, whether for torment or to combine as one.
Some might have plans to do evil deeds, or to just feel their souls in a body for the pleasure of it, but some might enter a body accidentally without knowing until the last minute, but once inside a body, they will change both the mind and body of the mortal they enter.
The gateway for them to possess this town is opening and won't stop anytime soon.