Dungeon Sherpa, a general term for those who make a living by carrying the baggage of adventurers while leading the way for them in their search through labyrinths. Rou is a young but skilled sherpa whose activities are based in Tairos Labyrinth.

Alhough Rou lost his father half a year ago and works to support his younger sister who he lives with, he is forcibly dragged into helping the hero who made a name for herself at the royal capital as the "Twilight Blade."