Kou-1 desu ga Isekai de Joushu Hajimemashita

Hiroto Kiyokawa is an entirely unremarkable first-year high school student whose ordinary life is abruptly shattered when a mysterious, ancient map pulls him into another world. Upon his unexpected arrival, he discovers that he has been summoned as the Diferente—a prophesied savior from beyond the boundaries of their reality. The local lord responsible for bringing him across dimensions immediately issues a demanding decree: Hiroto must use his newfound status to eradicate the vampires that threaten their realm. Rather than blindly obeying this violent mandate, Hiroto rejects the role of a mere weapon. Instead of embarking on a campaign of extermination, he conceives a far more ambitious vision. He resolves to establish his own sovereign nation, one built upon the radical ideal of peaceful coexistence among various races. By choosing diplomacy and unity over destruction, the young freshman sets out to forge a sanctuary where beings such as vampires and mummies can live side by side in harmony, defying the expectations of those who summoned him.