At Spell School, Tom and Twigs are chosen by Treetog to learn a new kind of magic with the mysterious Red magic master, Muru. However to perform red magic, they first need a red crystal, so Muru sets them on a journey to the deepest, darkest caverns to find one. Nearby the Mushas overhear this and decide they want the red crystals for themselves and hatch a plan to get some.