Upon birth, mages obtain one of four "crests" which exemplify their magical ability. Using his crest for creation, Gaius attained unparalleled strength and became the strongest sage in the world. However, Gaius yearned for a crest suited to close combat, but knew that a mage's crest cannot be changed. Determined to alter his destiny, Gaius decided to reincarnate far in the future. After millennia, Gaius was reborn as Mathias Hildesheimer and achieved his desired crest. However, Mathias was astonished to find that magic had drastically declined and his coveted crest was now deemed the weakest, referred to as the "Crest of Failure". Nevertheless, Mathias excelled in every task and enrolled in the royal capital's Second Academy. Unfortunately, Mathias discovered that humanity's apparent magical stagnation was due to demons. With the knowledge of their influence, Mathias aims to correct the consequences of his long absence and save humanity from despair.