Luigi Quest's story revolves around a Dark Star, which crashes into the Mushroom Kingdom, spreading chaos, and also a search for Mario. When you first join the game, you speak to Toad, and he tells you about a Dark Star which crashed into the Mushroom Temple, and that he saw Mario walking "almost zombie-like" into the temple and vanishing. Thinking Bowser is behind it, Luigi decides to travel to Grass land to put a stop to Bowser once and for all.