Born with the skill "guidepost", all Route could do was guide others safely on their journeys. Seen as useless, he was mocked by fellow adventurers.

One day, he's hired by Marx, a top adventurer, to guide his team through a deadly dungeon. But after reaching the deepest floor, they betray him, leaving him behind as bait.

Cornered and facing a dragon, Route's true ability awakens—the power to find the optimal solution to any situation.