Ep. 1: Departure Ballad

On the road to Megalopolis, Tetsuro is encountered by Count Mecha and watches as his mother is killed. Ironically, he is rescued by a woman who looks remarkably like his mother, and they set off on a journey on the Galaxy Express 999. He begins his trek towards the planet where he'll be able to receive a mechanical body. (Source: Crunchyroll)

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