Though I was tasked with running a dungeon, it was in a state of abject poverty.

It was in such a state that I couldn't even properly generate a single monster.

As such, I'll be the monster! I'll be the trap! And to top it off, I'll even be the treasure sleeping in the dungeon!

Fight, Dungeon Master! He who does not work shall not gain experience points!

This is the story of a high school girl who, having lost her original world to an invasion by people from another world, becomes a Dungeon Master and fights within a dungeon to reclaim it.

\*Please note: The protagonist actively kills even innocent people, so discretion is advised for those uncomfortable with such content.\*