A washed-up adventurer dies pathetically and wakes up as a skeleton, which should be a joke premise. Instead, the show treats his slow crawl back to humanity like a genuine philosophical question: what do you owe yourself when you've already failed at everything. The character writing is sharp enough that watching a coward figure out how to be brave again, one small monster at a time, becomes the entire point. It moves slowly on purpose, but that patience pays off in moments where Rentt's bitterness cracks and he actually cares about something besides his own resurrection.
Rentt spent a decade as a bottom-tier adventurer, scraping by on copper coins while hunting weak monsters in the same tired routes. When he stumbles onto an unmapped cavern, he finally thinks his luck has shifted. Instead, a legendary dragon makes quick work of him. He wakes up as a skeleton. Trapped in his own undead body, Rentt refuses to accept this as his final form. He discovers he can evolve by hunting stronger creatures and absorbing their power. What begins as a desperate quest to reverse his curse becomes something stranger: a chance to actually become the adventurer he always wanted to be. Every battle pushes him further from human and closer to something far more dangerous. The catch is time. As he grows stronger, his memories of humanity slip away. Rentt races against his own transformation, hunting legendary beasts and uncovering secrets about the world while clinging to whatever makes him who he was. This is a story about power and the cost of becoming unstoppable.