It's been about one year since I started managing this dungeon with dreams of living a work-free life. A nice and relaxed spring was ahead of me... until I ended up thrown into a three-way Dungeon Battle?! What the hell happened at the Dungeon Core gathering...? Wait, we're on a team with our guardian Core? And Rokuko's guardian is Haku, right?! Uh, given how romantic things have been getting between me and Rokuko, I'm gonna have to say n—"I look forward to battling with you on my side, Keima." "S-Same to you, ahaha!"Am I gonna die before the Dungeon Battle even starts?! This is Volume 5 of my own lazy kind of dungeon story!