In Shahal City on the planet Al Shahal, Hayate Immelman discovers a stowaway named Freyja Wion in the shipping docks. Freyja stowed away to run away from an arranged marriage and to audition for the idol group Walküre on the planet Ragna, but Hayate informs her that she is on the wrong planet. When a Vár outbreak suddenly causes Zentradi soldiers to go rogue and attack the city, Walküre and Delta Flight scramble to contain the threat, but are later on met by the Aerial Knights in a fierce dogfight. During the battle, Freyja sings along with Walküre and assists with suppressing the Vár while Hayate commandeers an abandoned Valkyrie and uses it to protect Freyja.

On the planet Randall, the time comes to Freyja's first concert as a member of Walküre, as well as Hayate's first sortie as a member of Delta Flight. Everything runs well until the Aerial Knights strike again, while at the same time causing a mass Vár outbreak. Mikumo and Freyja begin singing in unison to stop the outbreak, and the other Walküre observe how Freyja's song seems to amplify Mikumo's, managing to suppress the Vár outbreak on their own. Meanwhile, the Aerial Knights reveal that while they have been distracting Walküre and Delta Flight, they had successfully seized the planet Voldor with their army and announce a declaration of war from the Kingdom of Wind to the New Unified Government.