Growing out of the chaos of a global war, the city of Utopia is populated by humans and bioroids (artificial humans). On the surface, everything is harmonious, but tensions lurk. Into this seemingly perfect society comes a survivor of the wars, Deunan Knute, who carries a legacy that will turn out to be of critical importance to the future of humanity. 
(Source: Anime News Network)

Deunan, a young female warrior, and Briareos, a veteran cyborg-soldier, are both partners and lovers. As members of E.S.W.A.T., the elite special forces serving Olympus, they are deployed whenever trouble strikes. The two fighters find their partnership tested in a new way by the arrival of a new member to their ranks - an experimental Bioroid named Tereus.
 
(Source: Anime News Network)

Earth's last city, Olympus, rose from the ashes of global war on the backs of Bioroids, artificial clones who make up half the city's population. Under the guidance of a supercomputer, humanity's last survivors enjoy peace, but only on the surface. Human terrorists within the military seek a return to power and clash with the government's forces led by the legendary soldier, Deunan Knute, and her boyfriend who is 75% machine. 
 
(Source: Sentai Filmworks)

Appleseed Alpha depicts the early days of Deunan Knute and Briareos in the 22nd century, as they embark on a journey throughout dystopic ruins of New York in search of the city of Olympus. They are hired by Two Horns, the warlord of the ruined city, to eliminate bipedal combat machines. During the fight, they encouter Iris and Olson, both on a mission. Deunan and Briareos befriend with them and decide to join their mission. 
 
Iris is tasked with preventing the malevolent cyborg Talos from capturing a secret weapon humans were building. Talos uses Iris to activate the gigantic war machine. 
 
(Source: Wikipedia)

After facing massive destruction from a devastating war, the city Olympus has become the last stronghold as the center of command for the world. In order to protect the city from a group of terrorists known as the Argonauts, former LAPD SWAT member, Deunan Knotts, runs special military forces consisting of Biroids (cloned humans) and her cyborg partner Brialeos. Knotts must protect the city at all costs but is met with difficulties when Al Ceides, the Argonaut leader thought to be dead, resurfaces and causes problems. 
(Source: FUNimation)

It is the 22nd Century, the Third World War (2099-2126) has decimated a large part of Earth even though nuclear weapons have not been employed during the conflict. Old nations such as England, France and China have survived but have difficulty restoring their power. On the other hand, new nations and organizations such as the Sacred Republique of Mumna and the Poseidon Organization have been born on the ashes of the world resulting from the Third World War. 
 
In this bleak future, we are introduced to ex-L.A. SWAT members Deunan Knute and Briareos Hecatonchires. Having survived the world conflict and living in a desolated city, they are found by a young woman called Hitomi who proposes them to follow her to the utopian city of Olympus which has become the world's most powerful organization and which registers the new relations in terms of politics, economics and military between new and old nations/organizations. In Olympus, they are integrated in the prestigious ESWAT (Extra Special Weapons And Tactics) organization, whose main mission is to protect Olympus from terrorist attacks and Olympus's interests in the world. 
 
From here on, the two main protagonists encounter a great number of other characters and organizations who will be implicated in international plots that target Olympus.

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