The Unwanted Undead Adventurer Volume 3
Nozomanu Fushi no Boukensha, 望まぬ不死の冒険者
It's been ten years since Rentt Faina, a down-on-his luck Bronze-class adventurer, set his eyes on becoming Mithril-class. Unfortunately, Rentt finds himself helpless when confronted by a legendary Dragon in the Water moon Dungeon...and is summarily eaten. But Rentt has miraculously reawakened...as a Skeleton?!