Atsumaru Hi,

A group of individuals find themselves navigating a complex and mysterious environment filled with shifting doors and glass-like obstacles. They encounter a series of enigmatic events and locations, including a city named Mars Port and a time set in the year 2763. Throughout their journey, they face moments of silence and solitude, as well as cryptic messages and legacies left behind. The narrative unfolds through a sequence of seemingly disconnected yet thematically linked episodes, each contributing to a larger, unresolved mystery.