Ginga Tetsudou 999: Kimi wa Haha no You ni Aiseru ka!!

Small creatures board the 999 with an urgent plea: their mother lies directly in its path. Tetsuro wants to help, but the train refuses to change course and plunges into the enormous living being.

Artemis, a woman with a mechanical body, arrives and calls the creature her mother. As the railway authorities prepare to destroy it to free the train, Tetsuro confronts a bond that defies appearances and a rescue plan that threatens an innocent life.