Zongman: The strongest demon king from Juwang Academy

Roy traveled to the world of Demon High School and became Gurefia's younger brother, the sole heir of the Luke Fergus family.
And obtained the devil chess piece system, from then on Roy walked on the road of conquering the dependents across the world and becoming the strongest devil king.
Saeko Busushima: I swear on the honor of the Busushima family, I am willing to be Roy's knight.
Butterfly Shinobi: As long as I can save my sister, I am willing to be Roy's soldier.
Estes: If you want me to be your queen, then beat me!
The main world is the world of Demon High School.
Across the World: Apocalypse of the Academy——Blade of Demon Slayer——Pokemon——Slashing the Crimson Eye——Miss Kobayashi's Dragon Maid——God Eater—to be continued