Kazuki Shiro was just an ordinary young man struggling to find a job—until one day, a scientific experiment gone wrong wiped out most of humanity and reshaped the very laws of the world. Ten thousand years later, magic has replaced science, monsters roam the land, and new races born from mutated mana dominate the continent of Landcraft.

Shiro awakens in the body of a ten-year-old boy named Ishiki Shin, reborn into this unfamiliar medieval world. With the memories of his past life intact and a spark of magic igniting in his hands, he seizes the chance to start over. But life isn’t easy: abused by his stepmother, ignored by his father, and cast aside like trash, Shin sets out on a journey to forge a new destiny as an adventurer.

Armed with courage, sarcasm, and the tiniest flicker of flame, he steps into a world where danger lurks in every shadow—and greatness waits for those brave (or foolish) enough to chase it.