Book 1

Based on the prize-winning web novels in Japan! In a time when dungeons and monsters have appeared in our world, a struggling modern adventurer finds a fantasy dungeon–and a special treasure–under his Hokkaido home.

Since the discovery of fantastical dungeons all across Earth, slaying monsters and clearing out dungeons has become a popular pastime. Twenty-seven-year-old Karaboshi Haruki dreams of gaining recognition as an adventurer, but he's got two monstrous problems: he's socially invisible and has literally no skills at adventuring. When a dungeon suddenly appears in his garage, however, he finds a skill board that allows him to level up faster. The dungeon-diving adventures Haruki has always dreamed of are just getting started!

Book 2

LEVELING UP

Haruki might be invisible, but he makes up for it with courage and his secret skill board, which has proven its worth with countless dungeon spoils. While his skills are growing by the day, Karen’s have a long way to go. Can Haruki and his skill board help her level up, too?

Book 3

BOSS FIGHT

Haruki is in the thick of battle with the monster swarm boss—a werewolf! It’s pretty clear he’s in way over his head; a single blow could knock him out…forever. Does he have what it takes to avoid defeat and take down the boss?