While the original light novel by Kenkyo na Circle started the series, the manga adaptation illustrated by is the reason for the global explosion of the keyword "tensei shitara dainana ouji datta node kimama."

Inside, he found a lich’s phylactery, a mirror that showed alternate futures, and a tome bound in dragon-hide: The Spiral Codex of the Void Weaver . The book was supposed to drive readers mad. Leonhardt read it in an afternoon, then wrote a fifteen-page critique in the margins.

Now he was the seventh son of King Alistair the Mighty, a man who ruled through brute force and considered magic “a useful servant, but a poor master.” The first six princes were warriors, diplomats, or strategists. Leonhardt was spare parts—a political afterthought.