My name's Keima Masuda and I, having been summoned into another world and made into a Dungeon Master, decided to build things according to my ultimate plan of not working at all. My dungeon's gotten pretty big thanks to that duel, but it's not big enough for me to sleep peacefully yet! My next plan is to build an inn right next to the dungeon. That way, I'll get two sources of income at once! This inn will be my key to victory! But just when things were going according to plan, my expanding dungeon collides with a neighboring dungeon. I thought I wouldn't have to deal with annoying neighbors in another word! This is volume two of my own kind of dungeon story. Indeed, everything is so I can live without having to work.