Called “Juggernaut,” these are the unmanned combat drones developed by the Republic of San Magnolia in answer to the attacks by the autonomous unmanned drones of the neighboring Empire of Giad, the “Legion”. But they’re only unmanned in name. In reality, they are piloted by the Eighty-sixers—those considered to be less than human and treated as mere tools.

Determined to achieve his own mysterious ends, Shin, the captain of Spearhead Squadron, which is comprised of Eighty-sixers, continues to fight a hopeless war on a battlefield where only death awaits him. As his battle rages on, Lena, an elite Republic soldier, arrives as his new Handler. Loathing the way the Republic uses the Eighty-sixers as cannon fodder and despises them for being “pigs in human skin,” she resolves instead to treat them as human beings.

A young man and Eighty-sixer who constantly faces death on the front lines, and a promising young woman of the military elite. Ordinarily, they would never have crossed paths, but now as a fierce war rages around them, they are looking towards the future…

[Source: Crunchyroll]

The Spearhead Squadron consists of those from the so-called "Eighty-six" who were exiled from the Republic of San Magnolia. They are fighting a tough battle against the Legion, autonomous unmanned drones of the Giad Empire. Although the squad has dwindled in numbers, the survivors are sent on a "Special Recon Mission"—a one-way trip to Legion territory with a 0% chance of survival.

Although it's a death sentence to which their homeland has condemned them, their leader Shinei Nouzen, along with Raiden Shuga, Theoto Rikka, Anju Emma and Kurena Kukumila, decides to go ahead and continue fighting.

They don't fight because they have hope or for the future. They keep fighting because the battlefield is the only place where they feel they belong.

[Source: Crunchyroll ES; translated]