Takuma Sakamoto, a secluded gamer, is transported into the world of his favorite game, Cross Reverie with the appearance and powers of his own character in the game, the Demon Lord Diablo, where the Pantherian Rem Galleu and the Elf Shera L. Greenwood accidentally fall into an enchantment that bound them to him as his slaves. The trio settle in an inn in Faltra City, where they meet Celestine Baudelaire, the head of the Mage Association...