百鬼 ～淫黙された廃墟～

"Ouka Island," an island once bustling with life...

With a circumference of just over one kilometer, the island nevertheless prospered with coal production, and at its peak was packed with 10-story buildings, boasting a population density that surpassed that of Tokyo.

With a public park, a shrine, even a school and a hospital, "Ouka Island" was a fine city despite its small scale.

However, due to main energy production switching from coal to oil, the island's coal mine was closed down.