The Unwanted Undead Adventurer (Light Novel): Volume 6

Rentt Faina, the undead adventurer, arrives at his hometown of Hathara. He's joined by Lorraine, a scholar and sorcerer. The villagers are all excited to meet Lorraine, and to celebrate Rentt's return, they throw the two a welcome banquet. During the banquet, Rentt slips out. Lorraine finds him at a graveyard, where he reveals the incident that motivated him to become a Mithril-class adventurer.
Our undead adventurer's journey continues! But this time, not only does he have to face off against powerful monsters, he also uncovers decades-old secrets that involve not just his hometown, but also the Faina family themselves...