Nozomanu Fushi no Boukensha

A twenty-five-year-old adventurer spends ten years battling monsters but struggles to advance, earning little while fighting weak creatures. His routine changes when he discovers a hidden path in a labyrinth. Instead of finding treasure, he is eaten by a legendary dragon. After briefly regaining consciousness, he awakens as a pile of bones. Now a skeleton, he continues his journey in the labyrinth, carrying his sword and tools. His goal is to achieve a transformation that might restore his humanity. The question remains whether he will succeed or be trapped in the labyrinth forever.