Hakuto Kunai

Behind the fearsome visage of Hakuto Kunai lies Akira Ono, an ordinary office worker whose self-developed online game, Infinity GAME, met its server shutdown—only to transport him into another world in the form of its ultimate antagonist, the Demon King. Wielding overwhelming power beneath an imposing demeanor, Kunai's true nature remains that of a rational, level-headed modern professional. After a chance encounter leads him to rescue a young girl named Yako, he sets out to find a way home. Yet a cascade of spectacular misunderstandings propels this reluctant overlord toward building an unexpected empire across the isekai realm.