In a realm where humanoid armored machines called 'Titatonostrider' ('TS') dominate combat, forces from multiple nations gather on Oahu, Hawaii, featuring Ao Isami of Japan's Ground Self-Defense Force and Lewis Smith of the U.S. Marine Corps, each carrying distinct tactical doctrines. During skirmish, Isami and Smith encounter each other, yet abruptly their squads face an unseen assailant, dispersing troops and plunging their units into chaos, forcing them to improvise under pressure. To rescue comrades and endure the lethal front, they must wield all their bravery and honor to prevail against overwhelming odds, and rally their allies together.
