In a fractured world where interdimensional Gates spit out monsters and humanity’s survival hinges on superpowered Hunters, our main character is a D-rank clinging to the shadow of his legendary sister, an S-rank prodigy who storms dungeons like a force of nature. Desperate to prove himself, Nox joins a rookie raid into a deceptively "low-risk" dungeon. But when the expedition triggers a hidden A-rank monster, he and his raid die at the hands of the monster, only to be turned into the very thing he once hunted: a Spirit Ape, one of the weakest monsters in the dungeon’s hierarchy.