In a world under siege by alien Neuroi forces, human witches with magical powers are the frontline warriors. Amidst dwindling morale, retired witch Grace Maitland Steward proposes a radical idea: using music as a potent force in the war effort. When her suggestion is dismissed, Grace joins forces with accomplished singers Aila Paivikki Linnamaa and Eleonore Giovanna Gassion to create the Music Squadron within the League of Nations Air Force. Together, they recruit seven talented witches, including 14-year-old Virginia Robertson, whose untapped potential could be a game-changer despite her lack of military background.