At the age of 36, Cain's life had finally ended. Suffering his whole life from a mental disability he was the target of scorn and neglect, however in his final moments he managed to regain clarity, only for the newfound light in his eyes to fade once more.
When he next opened his eyes he saw a new world where the peace between human and demon was about to collapse.
Luckily, he has a unique advantage.
He can read the language of magic.