Return Of The White Fox

Sayu was half human, half fox. When his whole village got killed by the humans, Sayu then awakens his powers as a God of foxes and promises to murder everyone who had anything to do with his family's massacre. He decides to make a contract with a demon in exchange for his soul and return, Sayu gets a system that turns into a pet fox.

Searching for every murderer, seething for revenge, Sayu meets the woman who is his fated one. Lika helps him train his God's powers to kill ungrateful humans.

With every death, Sayu realises that the killing wasn't worth his soul and aims to become more powerful than the Demon to break the contract and retrieve his soul back.