"Gekijō-ban Macross Delta: Gekijō no Walkūre" is a film adaptation of the "Macross Delta" anime series, condensing and reimagining its narrative into a cinematic format. The story is set in a distant future where humanity has expanded across the galaxy, encountering various alien species and cultures. The central conflict revolves around the Var Syndrome, a mysterious condition that drives people into a berserk state, threatening galactic peace. The Windermere Kingdom, a small but powerful interstellar nation, seeks to exploit this phenomenon to assert dominance over the galaxy, using ancient Protoculture technology to amplify the Var Syndrome.

The protagonists are the members of Walküre, an idol group that uses their songs to counteract the Var Syndrome, and Delta Squadron, a team of elite Valkyrie pilots who protect them. Walküre’s music, powered by Fold Waves, has the unique ability to calm those affected by the syndrome. The story focuses on Freyja Wion, a young Windermerean girl who joins Walküre after fleeing her home planet, and Hayate Immelmann, a carefree pilot who becomes a member of Delta Squadron. Their personal growth and relationships are central to the narrative, as they navigate the challenges of war, identity, and duty.

The plot intensifies as the Windermere Kingdom launches a full-scale invasion, aiming to spread the Var Syndrome across the galaxy. Walküre and Delta Squadron must unite to counter this threat, leading to a climactic battle that tests their resolve and teamwork. The film explores themes of cultural conflict, the power of music, and the bonds that form in the face of adversity. Key characters include Mikumo Guynemer, Walküre’s enigmatic lead singer with a mysterious connection to the Protoculture, and Keith Aero Windermere, a skilled Windermerean knight driven by loyalty to his kingdom. The narrative balances action-packed space battles with emotional character arcs, culminating in a resolution that ties together the fates of the characters and the galaxy at large.