One day, while Mamiya Hikaru was immersed in the swamp of being an otaku and enjoying an otaku life, he played 『Arcadia Fantasy』 for several days straight and ended up getting the honor of clearing it the fastest. While basking in sentimentality, Mamiya lay on the bed and was about to give in to his drowsiness when he heard a mysterious machine-like voice coming from the game console he had forgotten to turn off saying, “Downloading a special patch.” By the time he woke up, he realized that his body had become younger. It seemed like Mamiya had been reincarnated into another world and had become a boy named ‘Lux’. After living there for a while, he went to a nearby town to have his magic aptitude checked. And it was revealed during the magic appraisal, his power was ‘Creation Magic’. At that moment, he realized it. “Aren’t I the hidden boss, Supreme Ruler of the Morning Star, Lux?!”