Dungeons That Surely Slaughter Adventurers, Vol. 1: Volume 1

While most reincarnated earthlings get to live out awesome isekai fantasies as adventurers who plunder dungeons for fun, fame, and profit, Aine and Nacht drew the short straw and got stuck as the dungeon's custodial staff instead. It's a messy job--whether the heroes win or lose, there's always a pile of corpses that needs tidying up afterward. But if the two are disposing of bodies anyway, then...what's a few more? Might as well turn the joint into a full-blown death trap and show those friggin' inconsiderate adventurers what for!