* Based on a series of illustrations entitled Earth SOS, which were created by Komatsuzaki Shigeru and published in the 1940s.

The entire series takes place in a version of the nineties redone into Retro-futurism, being behind in current technologies, and far ahead in others. On January 1, 1995, a G-Reactive fighter plane was being tested, while it was hit by a mysterious rainbow light and disappeared. 5 years later, two boys, Billy Kimura and Penny Carter, meet at a train station where a new bullet train utilizing G-Reactive was being launched. However, to their shock, the train was hit by a rainbow beam of light, and disappeared. After a series of events and acquaintances, the two boys discover that aliens were beginning to invade Earth. Fortunately, scientists developed the Sky Knight, a fighter plane capable of defending the world. As the extraterrestrials begin to invade, Billy, Penny, and their comrades begin their attempt to save the human race from the alien menace.

Source: Wikipedia

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