Lazy Dungeon Master (Manga) Vol. 6

"Keima can't seem to catch a break. When an adventurer named Wataru arrives at the Cave of Greed, he's not looking for monsters to slay or a room at the inn. He's looking to marry Rokuko! Once it becomes clear he's not just out to split Dungeon Master and Core apart, Keima decides to put his tricks to the test and challenge Wataru to a game. But this isn't any ordinary game. This one's got golem dice, high stakes, and the dungeon's future on the line! Who will be victorious?!"--