The Unwanted Undead Adventurer (Light Novel): Volume 6 — Yu Okano

Rentt the undead adventurer arrives at his hometown of Hathara along with Lorraine, a scholar and sorcerer. It's his first visit in some time, and the village celebrates with a welcoming banquet. However, during the banquet, Rentt disappears. Lorraine finds him at a graveyard, where he reveals the incident that made him want to become a Mithril-class adventurer, and much more. Fighting powerful monsters and unraveling many mysteries, Rentt keeps climbing the ranks even in death!