A mysterious shop hidden in the world but known only to a few people. Its purpose is to solve the troubles of its customers. It can realize all kinds of weird wishes of people. Of course, the exchange conditions required are huge. . . It is said that the shopkeepers and shop assistants are extraordinary beings who never appear on weekdays. They will only show up to sign contracts when customers who satisfy them appear, so that customers will realize their wishes. . . Who knows their purpose? Who knows how many reincarnations, conspiracies and curses from past and present lives it contains?