Nozomanu Fushi no Boukensha望まぬ不死の冒険者; The Unwanted Undead Adventurer; 바라지 않는 불사의 모험자; 事與願違的不死冒險者; L'aventurier immortel indésiré; Нежеланно бессмертный авантюрист

The protagonist was an eternal copper rank adventurer of frontier area, Lent. He’s unlucky as he meet a powerful monster inside of the labyrinth, got defeated, and when he noticed, he already became a bone man《Skeleton》. Agonizing since he can’t enter the town with his current condition, he’s recalling about the existence of monster evolution, with a goal to gain a body with muscle, he defeats the monsters of the labyrinth.