An adolescent girl searches the deep dark woods for her missing dog, entangling her destiny with a chivalrous mushroom faerie on a mystical quest to protect the biome from catastrophic ruin.

The Mushroom Knight follows the adventures of Gowlitrot the Gardener, a sentient bipedal fungus created by a race of woodland gnomes called Gödels, as he investigates and unearths a deadly conspiracy that reveals the true nature of himself and the devastation humans have wrought upon the global biosystem that he has sworn to protect.