The Bang Brave Bang Bravern anime takes place in a setting where humanoid armored weapons called Titatonostrider (TS) are used by various countries in warfare. The story centers around a clash between different military forces on the island of Oahu, Hawaii, involving characters like Ao Isami from the Japan Ground Self-Defense Force and Lewis Smith from the United States Marine Corps. Isami and Smith find themselves fighting a common enemy after their respective teams are ambushed, forcing them to work together to save their comrades and survive the battlefield.