After the fall of Akivili, the Aeon of the Trailblaze, their trailblazing will was inherited by their followers, the Nameless, including the Astral Express that the Aeon once rode on. However, as the Cancer of All Worlds continues to spread, the star rails that the Express runs on also fell victim. The Express could barely run before the blight descended, and had no choice but to run around when the rails became overly obstructed.
It remained so for many years until a girl with red hair discovered its existence. She was fascinated by the stories the engine and the star rails had in store. She spent countless hours repairing the cracks and evening the dents, restoring the Express to its original form. The curious girl then set foot into the Express and began her trailblazing voyage across the galaxy.
The Astral Express made stops at every station, with passengers boarding and exiting along the way. Many join and leave the Express' journey. The travelers come from different worlds, shoulder different burdens, and heading to different destinations. However, while they are on the Astral Express, they would share the same voyage. That is why Himeko and the Express do not hesitate to open the doors to anyone willing to share this magical experience, regardless of their agendas and intentions.