Kuroinu:The Return of the King (Kuroinu X Decedent heir reader)

Warning this will contain swearing, blood, sexual things.

Esotia was a kingdom where a king who rules in a fair way. Over years the king was very nice and generous as he gives his power to the poor. The king later died as he does not have a heir. It was unknown why the king did not married have someone he loves. Over years the kingdoms split as Celestine became the prime lord of Esotia. Over years the war between humans and the dark elves. Vault a corrupted man became lustful for power and the women. He went into a rebellion and took Queen Olga but Chloe her body guard ran away. Vaults plan was proceeding as good until a Ranger named Y/n appears. Y/n a ranger of Eostia was living his life defending his elf home until someone persuade him to become king. Y/n later rises up to become like his great grand father and restore the Kingdom of Eostia.