Manga Lazy Dungeon Master

Don't slow down! We need to get rid of those bandits! Are you too lazy to do this work?
Probably, but not this time. Forget about leisure. Imagine: you're summoned into a parallel world where you meet a beautiful blondie, Dungeon Core. You have to save her dungeon. If you don't cope with the task and the dungeon is ruined, you'll have to become a dungeon master. Imagine, this dungeon has only one room. And bandits control it. A checkmate, isn't it? It doesn't matter what you think of it. What are you going to do? Time to work!