Ep. 4: Walküre y el Escuadrón Delta se enfrentan a los Caballeros Aéreos y al brote de Vars durante sus actuaciones de debut

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The time comes to Freyja's first concert as a member of Walküre, as well as Hayate's first sortie as a member of the Delta Squadron. Everything runs well until the Aerial Knights strike again, while at the same time causing a mass Vars 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 Vars outbreak on their own. Meanwhile, the Aerial Knights reveal that while they have been distracting Walküre and Delta Squadron, they had successfully seized a different planet with their army and announce a declaration of war from the Kingdom of Wind to the New Unified Government. (Source: Wikipedia)