Mizuiro no Koukuu Shokan

A group of individuals navigate a series of distinct and enigmatic scenarios. The first involves a cyan-colored aviation letter, followed by a rainbow-hued nocturne. They then enter a building in a place called Kanbaland, attend a concert, venture into a forest described as inverted or perverted, and finally participate in a debut event. Each setting appears self-contained, with no further details provided about the characters, their relationships, or the overarching plot.