The Unwanted Undead Adventurer (Manga) Volume 11 by Yu Okano

Rentt’s past has been laid bare, but our undead hero is not one to let bygone memories stop him from moving forward. He and Lorraine head toward the reason for his homecoming: the shrine that keeps the secret of Rentt’s divinity.
Rentt’s old teachers, however, have a thing or two to impart upon him now that he’s back, and they’re not afraid of beating their lessons into him—literally. The village of Hathara hides a momentous secret, but if Rentt wants to discover the truth, the student will have to overcome his old masters!