When inadvertently summoned by an ancient map, high school freshman Kiyokawa Hiroto is compelled by the haughty castle Lord to vanquish the vampire plaguing the domain. Surprisingly, he forges an alliance with a girl from the Mummy tribe, successfully apprehending the vampire with her aid. Yet, his efforts are swiftly twisted by the castle's ruler. With courageous aspirations of becoming a Lord, Hiroto embarks on a fantastical journey of being summoned to another world.