Based on the story by manga master Leiji Matsumoto (The Cockpit, Queen Emeraldas), the 55 minute featurette picks up one year after the events of Galaxy Express 999 in which a young boy named Tetsuro and his motherly companion Matel worked to rid the universe on the Mechanized Empire who had taken over Earth. 
(Source: AniDB)

Two years after the events in Galaxy Express 999, Earth has become a battleground. Tetsuro, older and fighting the Machine People, rejoins Maetel aboard the GE999.

One year after the events of the First Cycle, Tetsuro has returned to Earth only to end up chained in his home in Megalopolis. It is then that Maetel appears before him once again, offering him the opportunity to join her on a new journey - one she claims will lead him to his destiny.
 
Note: Started 15 years after the series initially ended serialization. The second cycle makes up volumes 15-21.

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