Mukouda Tsuyoshi was nothing special in modern Japan, so when he was summoned to a world of swordplay and sorcery, he thought he was ready for the adventure of a lifetime. Too bad the kingdom that summoned him only got him by mistake! Not only was he not one of the three summoned heroes, but his stats were laughable compared to theirs. On top of that, there's something really sketchy about this kingdom... "Ah, these people are the kind to try and use the Hero," he realized, and immediately left to make his own way in this other world.

Another day, another dungeon! Or rather, another day, the same dungeon, because even though Mukohda would much rather make the most of his mid-dungeon break by lingering on the surface and enjoying a breath or two of outside air, a certain trio of battle-happy gluttons have dragged him right back into the depths again! Fel, Sui, and Dora won't be satisfied until they conquer every last floor that the Brixt dungeon has to offer, and the most Mukohda can do is grit his teeth and tag along for the ride.But hey, it's not that bad—after all, if the first forty floors were simple enough for Team Familiar to steamroll through, then surely the next who-knows-how-many won't pose any dangers or inconveniences either, right? And it's not like there are any horrible primeval monsters lurking somewhere down there that everyone—except for Mukohda—has forgotten the gods specifically warned them about, right?!