Based on the award-winning Japanese web novels! A struggling modern adventurer discovers a fantasy dungeon–and a special treasure–under his Hokkaido home at a time when dungeons and monsters have appeared in our world.
Slaying monsters and clearing out dungeons has become a popular pastime since the discovery of fantastical dungeons all over the world. Karaboshi Haruki, 27, aspires to be recognized as an adventurer, but he faces two formidable obstacles: he is socially invisible and has no experience with adventure. When a dungeon appears in his garage, he discovers a skill board that allows him to level up more quickly. The dungeon-diving adventures Haruki has always fantasized about are about to begin!