After seven years at the Boohland School for Monsters, Storm and his friends are preparing to wrap things up. And that means training for their exit exam, the Three Heroes Tournament! But during a ...routine mission, things go off the rails and Storm suddenly finds himself in Hades, the infamous magical prison! He escapes just in time, but not without bringing back a small souvenir: the evil spirit Gallu. That spells trouble for Storm, who already has his hands full dealing with his studies and the tournament, not to mention his love life... He'll have to keep his new companion a secret—and under control—if he hopes to make it through in one piece!