The story revolves around Takuma Sakamoto, a brilliant but socially awkward gamer who spends his days dominating the MMORPG Cross Reverie . His character, the Demon Lord Diablo, is so powerful that other players jokingly call him the Demon King himself. Everything changes when Takuma is mysteriously summoned to a fantasy world that closely mirrors the game—still wearing his in-game avatar's body. There, he meets Rem Galeu, a petite Pantherian adventurer, and Shera L. Greenwood, an elf. As the girls attempt to enslave him using a summoning spell, the magic backfires and binds them to Diablo instead, forcing the trio to navigate this new world together.
The Demon King Academy, where Satō and his friends attend school, is a central hub of activity in the story. The academy is home to some of the most powerful demon kings in the world, and it is here that Satō and his friends learn the skills they need to survive in a world filled with danger. The story revolves around Takuma Sakamoto, a brilliant