Record of Lodoss War, which was also adapted into two anime series (or maybe it was the other way around), was based on a series of novels that were inspired by the writer's D&D game. I haven't read the manga, but in the anime you can see a lot of D&D influence, right down to the classic fighter/rogue/wizard/cleric/token-elf-and-dwarf party. All in all, it's a pretty fun experience.