Ty is a spirit mouse living in a forest. One day, the forest is engulfed by darkness, and he sets out on a journey to defeat it. Along the way, he falls into the trap of a spider demon and is defeated. Blaming himself for his weakness, Ty feels like giving up. But then, a mysterious man appears and effortlessly destroys the spider demon. Witnessing his incredible strength, Ty realizes this man is his last hope.