It is the 22nd Century. The Third World War (2099-2126) has decimated a large part of Earth, even though nuclear weapons were not employed during the conflict. Old nations such as England, France, and China have survived but struggle to restore their power. Conversely, new nations and organizations, such as the Sacred Republique of Mumna and the Poseidon Organization, have emerged from the ashes of the world left by the Third World War. In this bleak future, we meet ex-L.A. SWAT members Deunan Knute and Briareos Hecatonchires. Having survived the global conflict and living in a desolate city, they are approached by a young woman named Hitomi, who proposes that they follow her to the utopian city of Olympus. Olympus has become the world's most powerful organization, registering new relations in politics, economics, and military affairs between new and old nations and organizations. In Olympus, they are integrated into the prestigious ESWAT (Extra Special Weapons And Tactics) organization, whose main mission is to protect Olympus from terrorist attacks and safeguard Olympus's interests worldwide. From this point on, the two main protagonists encounter a great number of other characters and organizations who will be implicated in international plots targeting Olympus.