My name is Keima Masuda, and my hobby is doing exactly nothing every day... but one fateful night, I was summoned to another world where I met a blonde young girl who I named Rokuko. It seemed that fortune was on my side and I would soon be living a wonderful life free of work. But even though I'm a guy who loves sleeping more than eating, Rokuko demanded that I help her. “Save my dungeon! By the way, since you're the Dungeon Master, you'll die too if the Dungeon Core is destroyed.” The dungeon only had one room, and the Core was already surrounded by bandits. Seriously? It's a checkmate already. I've gotta break out of this impossible situation so I can stop working and just sleep!
Source: J-Novel Club
Lazy Dungeon Master (Light Novel)