Time to Strike Back! [The Promised Neverland/Owari No Seraph x Reader ]

Since the dawn man two species are at constant war with each other for survival. The humans fought for freedom while Demons fought for livestock. For Centuries countless lives were taken and the Demons grew in Numbers, then he came. Caesar unified the world against the common foe and drove them to near extinction, he established the first empire and declared himself emperor. But with great power comes great jealousy, he had been backtabbed and the Empire fell into shambles.

Then 300 years prior to the Story. A man named Napoleon again lead another revolt against the Demons, he was victorius! he drove the demons back! he was an amazing tactician. He outmanuevered the demons and won nearly all of the battles that took place. Then the Demons evolved, they grew in size and strenght.. they drove Napoleons borders back. Napoleon was then Forced to sign a Treaty with the Demons...

Napoleon, despite being against the Treaty he had no choice... he lacked the technology to counter the Demons. The Treaty Of Paris was signed, the treaty states that the demons will be allowed to keep Human Livestocks and will control 80% of the world surface. While the humans will keep their freedom and dignity. Napoleon could only blame himself for not being strong enough. "One day there will be a leader who will drive the demons back to where they came from, he will be the hope of humanity..." Napoleon stating his last words to his successor. Then he passed away.

Let us Follow the Adventure of a Young Prince who swore to get back at the Demons. The empire of Francia which was changed to Avalon the day of his coronation. Will they succeed with the help of certain characters?

This is a mixed AU

Instead of "The Demon Dimension" they built the farms in the human world.

I do not own The Promise Neverland and Owari no Seraph. All credits go to the respective author.