Now, unknown menace is approaching to the human being from outer space to invade. AD 2000, highly developed science reaches its acme, and the human begins are enjoying their brilliant age using dream engine, "G reactor".
At the opening ceremony of a bullet train, Inazuma-go, which runs from the capital Metropolitan to New York only for 90 minutes, Billy Kimura, Benny Carter, and Lotta witness a mysterious event. Inazuma-go is swallowed into iridescent light and gone. While Billy and Lotta are investigating the event, they know other disappearances occur all over the world. However, these events are not informed citizens, and they haven't noticed them.
United Nations organizes the Earth Defense Organization, Labyrinth, to investigate the event in order to confront the menace.
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