In the year 2067, a decade after the events of the previous Macross Frontier series, Macross Delta follows the journey of Walküre, a group of skilled idols, and the Delta Squadron, a unit of seasoned Valkyrie pilots. Together, they combat the enigmatic Var Syndrome, a cosmic threat engulfing the galaxy, while facing off against the enigmatic Aerial Knights Valkyrie fighter team from the Kingdom of Wind.