Synopsis: Lazy Dungeon Master

All Keima Masuda desires is a peaceful slumber. Unfortunately, he finds himself unwillingly transported from his cozy bed to a fantastical dungeon where he must take on the role of protector - failure resulting in dire consequences. The only assistance he receives is from Rokuko, the Dungeon Core personification. However, Rokuko is bumbling and unable to even handle a gang of thieves. To ever hope for restful nights in the future, Keima must take full charge and organize everything on his own.