I've Been Promised to a Demon

In my world, beings of paranormal, physical, and spiritual manifestations come into existence. These beings are known as gods, demons, and guardians. Their natures and roles take shape from the people and the environment that nourished these beings at their beginning while fueling their roles. The will of the World Life Entity forces these beings to fight with man upon their creation in glorious battle and claim dominion over the other. Those gods and demons that lose to the man become guardians and are put under the dominion of a caretaker. When the caretaker's life extinguishes, the battle for dominance begins anew. When the god or demon wins, they rule over the populous according to their nature. Once these beings rise to power, they must choose a spouse from among all the life forms in their district. As one such city that lost in this battle, I was chosen by the demoness to be her spouse and will soon be wed. This is our story.