In a world where mages are granted one of four random crests at birth that define their magical abilities, Gaius, a master of the creation crest, rose to become the most powerful sage in existence. Despite his extraordinary power, Gaius felt unsatisfied, longing for a crest suited to close combat. Recognizing that altering his crest was impossible, he chose to reincarnate in a distant future, hoping to change his destiny.
Reborn as Mathias Hildesheimer millennia later, he finally possesses the crest he desired. However, he finds that magic has severely deteriorated over the centuries, with once-common spells now only existing in legends. Worse still, the crest he coveted is now considered the weakest, mockingly called the "Crest of Failure." Unfazed, Mathias exceeds all expectations. He enrolls in the Second Academy in the royal capital and excels in every area. Yet Mathias soon uncovers the grim truth behind humanity's loss of magical power: the interference of demons. Determined, he sets out to fix the consequences of his long absence once and for all.