What Would Happen If Fate Were Decided by Dice?

What would happen if a protagonist's actions in a novel were dictated by dice? An administrator, an adventurer, and a percentile die come together to tell a fantasy story set in another world. This story is based on true events. If anything is made up, well, then it's made up. An insignificant city guard. A chaotic adventure story. The world rests in the hands of two people, but the direction of the story and the characters' fates are decided by nothing more than a tiny die. An unexpected adventure is about to begin!

P.S. Updates are slow, and the book has a few in-jokes, so I might as well put it in the fanfiction section.