One day, a massive hole called Asylum is found in Antarctica. Simultaneously, the mysterious coma-inducing condition known as Randolph Syndrome starts spreading globally. Numerous nations dispatched investigation teams to the Asylum, suspecting it was the source of the illness, yet not a single individual returned safely. Sergiu Sol, a boy possessing unique resistance to the disease, and Hildegard Olympiada Yamada, a versatile expert in Antarctica, decide to tackle the challenge of the vast hole without a map, but...!? What causes the coma-inducing disease? What exactly is the Asylum? Descend to the deep, jet-black bottom, united with insanity.