The setting of Tech Romancer takes place in a far future of Earth, where advanced technology have made things calm and decent for the citizens of Japan and the rest of the world. However, the peace doesn't last long as an evil alien tyrant named Goldibus invades the planet with its loyal followers and seeks to conquer the world while enslaving the human race with an emotionless iron fist. An unlikely group of heroes band together to fight against the threat of Goldibus with their own unique mecha robots and all of them won't rest until Goldibus is defeated and the world is safe from the imminent danger.