階層都市断片集

Humanity met the end of its world by building upward: a colossal city stacked layer on layer by advanced technology, still spreading into the sky while the era around it runs down. Minamo and Mei live somewhere inside that structure. Each piece of the collection drops into a different stretch of the city's history and follows whoever is there, what they build and what they leave behind. It sits as a prologue to Girls' Last Tour, tracing how that world arrived at its ending.