CALL TO ADVENTURE! Defeating Dungeons with a Skill Board (Manga) Vol. 6

DUNGEON MYSTERY Now that the monster swarm boss has been defeated, Haruki heads back into his garage dungeon to push his skills to the next level. But something weird is going on!
All signs point to a boss battle, but he’s not the one fighting it. Who else is in his dungeon?!
Series Overview: 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!