Uchuu Koukyoushi Maetel: Ginga Tetsudou 999 Gaiden

Maetel returns home to La Metal after receiving a plea from her mother, the queen, aboard the Galaxy Express 999. Nearing the planet, the 999 is attacked but defended by forces from La Metal. Upon arriving, Maetel finds her mother who has demechanized herself, and seems to be back to her old kind self. However, something is still not quite right.

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Maetel abandoned her mother and her home planet, the doomed and frozen La Metal, where people must become cyborgs to survive. When she is beckoned to return, her options seem slim: follow her mother's path (and with it a robot mind and the contempt of all humans), or run away and fight with humans against the machines. Yet, she is not without comrades and defenders. If she can accept the friendship of beings of metal who desire peace, and oppose those who think being made of flesh and blood is enough to make one human, she may still have a chance to find her own path.