Something, Something, Supernatural

You're heading home after work minding your own business when you accidently stumble upon a turf war between two groups of monsters and beasts. you want none of it so you try to slip past but get caught up in it when one of the combatants stumbles into you. Your life gets turned upside down as a result as you're then forced to choose a side. (Character will start off human but player may have one of the many monsters or beasts in the story turn them later on)