Gunparade March: A New Song for the March

In the wake of an alien invasion that began in 1945, humanity finds itself united against a relentless threat that has persisted for over half a century. As the world grapples with the aftermath of the Pacific War, cultures converge under a single cause, forging a collective resistance against the extraterrestrial forces that dominate the skies.

Amidst this ongoing conflict, young recruits from the Japanese military, including Atsushi Hayami and his classmates, form Unit 5121. Tasked with defending their homeland, they pilot advanced HWT humanoid combat machines and wield powerful PBE bombs. Together, this brave new generation faces the challenges of war, grappling not only with the battles outside but also with their own personal struggles and budding relationships, as they strive for a brighter future in a world overshadowed by despair.