Mages are randomly assigned one of four crests at birth, which dictates the extent of their magical potential. Gaius, born with a crest specialized in creation, reached the pinnacle of his power and earned the title of the world’s strongest sage. Yet, he remains unfulfilled, yearning for a crest suited to close-quarters combat. Recognizing that a crest cannot be changed, Gaius chooses to reincarnate far into the future, hoping to rewrite his destiny.
Reborn as Mathias Hildesheimer thousands of years later, Mathias finally obtains his desired crest. However, he learns that magic has significantly declined in this era, and once-common techniques are now little more than faint legends. Furthermore, the crest he worked so hard to acquire is now regarded as the weakest, mockingly called the "Crest of Failure." Despite this, Mathias surpasses all expectations. He enters the Second Academy in the royal capital, excelling in every challenge. Soon, however, Mathias uncovers the dark truth behind humanity’s regression into magical mediocrity: demons. He sets out to correct the consequences of his long absence once and for all.