The Demon Among Us

Every planet that hosts intelligent life has a god or goddess. Earth also had one, but one day, the will of Teton, the god of Earth, suddenly disappeared.
The absence of Teton had left Earth ownerless, and after that, the other gods quickly divided Earth among themselves, like a cake on a plate. They sent the dominant life forms of their planet to invade Earth.
Humanity was about to face absolute destruction. Moreover, Teton's way of ruling Earth was quite different from other gods.
The invading gods had been carefully cultivating their planet and guiding the life forms they created as their lord. However, there was not even a single person on Earth who knew the name of Teton.
The invaders were powerful, and each had a united planet, while humanity did not even know they had a god. So, who could help humanity against such powerful opponents?
“Ke ke kek!”
“What thing do the other gods think they are? What am I gonna do if one day there would be no human left on Earth to whose sweet cries I could listen to? How will I pass my time if I can no longer find someone to corrupt? Who will I lead astray?"
"You cannot go extinct without asking me. We have not had enough fun yet!”
A demon thinks just like this and has already set his sights on a host to coexist with.
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The novel takes place in an alternate world. Events and characters have no connection with the real world.