The narration frames the story's events, emphasizing maternal bonds as central themes. It introduces the gelatinous planetary entity—a sentient mother harboring countless offspring—establishing her pivotal role in the conflict. During the Galaxy Express 999 crisis, the narration details the imminent Vibration Wave threat from Railway Headquarters, explaining its lethal capacity to annihilate the entity and heightening stakes as escape efforts unfold.

It bridges past and present through Tetsuro Hoshino’s flashbacks: memories of his deceased mother, a desperate mother who tried harming him to feed her child, and an insectoid mother launching offspring into space for survival. These recollections connect directly to his dilemma regarding the sentient planet.

The narration contextualizes Artemis’s backstory—her rejection of gelatinous origins, adoption of a machine body, disillusionment with mechanized existence under exploitation and debt slavery, and eventual return to merge with her planetary mother. This arc reinforces explorations of belonging and acceptance.

By presenting the entity objectively as an "unidentified life form" unavoidably crossing the railway tracks, the narration maintains neutrality, allowing audiences to interpret ethical implications of humanity’s response.