It’s already been 18 years since the last Great War between the Demon King and the entire world. Since then, the Demon King’s throne has remained vacant.
 
Hayato Nakamura (Ashford), a half-human and once-in-a-millennium magic genius, studies at the prestigious Sylvania Magic Academy for heroes, trained to fight against demons.
 
However, due to a series of fortunate—or perhaps unfortunate—events, he suddenly inherits the title of Demon King.
 
But demons are inherently vicious, bloodthirsty creatures who believe in the survival of the fittest, obeying only the strongest.
 
As a young and new student at a school meant to nurture the next generation of heroes to fight against the Demon King, he is far from being the strongest. His adventure is only beginning. 
 
Now, caught in the deadly web of demon world politics, Hayato must navigate his new role while trying to survive. He also has to watch out for trouble within the academy, especially from the prophesied Hero. 
 
To make matters worse, Hayato has an incurable disease that prevents him from using magic, his greatest strength.
 
Now, he must embark on a journey to find a cure while simultaneously claiming his rightful throne.
 
But how can he survive without his magic, especially when the entire world is against him?

1. The prefix 'Pan–' comes from Greek, meaning 'all' or 'including everything.' So 'Pan-Human Alliance' means 'an alliance that includes all of humanity.' 


2. Sumiko means longevity and beauty in Japanese. Aonami means blue wave.


3. In a historical context danna-sama meant master. In modern usage danna-sama is a very respectful way to say husband. 


Trivia.