The World's Fastest Level Up (Manga) Vol. 4 by Atsushi Suzumi

After weeks of maxing out dungeons, Rin finally completes his Dungeon Traveler title and unlocks the ability to challenge a brand-new dungeon - the Remote Magic Tower. The catch? Access to the tower is one-time only. Rin must prepare to face nonstop challenges that far surpass his expectations. Has he leveled up enough, or is he in over his head?
Binding: Paperback / softback