On a musical planet known as Melodia, a boy named Tempo is training alongside his rabbit companion, Tappy. One day, a meteor crash lands on Melodia, bringing with it the evil Gargan and his army of Noizoids, who start disrupting peace on the planet. Discovering a mysterious note staff capable of fighting off the Noizoids, Tempo is sent by his master, Woodwin, to travel to Symphony City to deliver the note to someone with the potential to become a HarmoKnight. Along the way, he meets an archer named Lyra, a buff warrior named Tyko and his monkey companion, Cymbi. Upon arriving in Symphony City however, its princess, Ariana, is kidnapped by Gargan, who puts its citizens into slumber. It is now up to Tempo and his companions to fight against the Noizoids and save the princess.
