The young boy Soraichi escaped from the prison where he had been imprisoned for seventeen years and was rescued by the weird old man Caotang Yuikaku. In order to pay for his own accommodation and food, Ichi worked in the old library of Caotang's family. In fact, the old man of Caotang entrusted him with the family's mission - Sora Ichi is a ghost, and he must annihilate the ghost guild - GeK. On this journey, I met all kinds of people: the enigmatic Cottage, the twin brother Tian Qingzao, the successor to the Eye of Sibylla...