Arifureta: From Commonplace to World's Strongest, Volume 9 (Arifureta: From Commonplace to World's Strongest #50-54)

After welcoming his old friend Kaori into their party, Hajime and company set off on a quest to conquer the Gruen Volcano. As one of the ancient labyrinths built by the Liberators in days of old, it contains rare magic that can't be found anywhere else... and the cure for the plague ravaging the nearby Duchy of Ankaji. Blazing-hot trials and unexpected adversaries await within, as Hajime's adventure starts heating up... literally!