There's a mysterious piano player at Angel Grove High, playing expertly after school. King Mondo desires to capture this person, as a gift for Queen Machina's birthday. Meanwhile, Adam, who gets stuck with Skull in music class, also takes an interest in the mystery of the piano player, attempting to both discover his identity, and keep the forces of evil from kidnapping him. The school's piano is turned into the Fortissimodo monster, making Adam's tasks even tougher.