Kiraware Ouji no Yarinaoshi

is a Japanese light novel series written by Naehara Hajime, with illustrations by Takamine Nadare. The series began publication on October 17, 2022 by ASCII Media Works under their Dengeki no Shin Bungei publishing imprint.

Synopsis
With [dark magic] that only I can use, I will increase the number of demons and start developing frontiers! A world where aptitude for magic is determined by crests. At the age of seven, Alek, the sixth prince of the Holy Luxia Empire, was given the crest of [Dark Magic], which was said to turn him into a demon if he used it. Despised by those around him, Alex, who has become withdrawn into the palace, uses [dark magic] to see him at the end of his life... "Why can't I take this guy's body! ? "  "Will I become a devil...?" Alex's crest was a special crest that allowed him to use [dark magic] without being taken over by the devil! But it's too late even if he realizes it now... Alex closes his eyes while regretting that... When he woke up, he was seven years old again! ? "Then there's only one thing to do... in this second life, master [dark magic]!" Using [dark magic] to make every demon his vassal, Alex will create an ideal country with his strongest comrades! A fantasy about redoing life and frontier development by a hated prince!