It is not a specter that actually has a legend of some sort, but it is said to be depicted as a creation imaging Guan Yu, based on the analects of Cao Cao and Guan Yu who were the characters from "Sanguo Zhi" (History of the Three Kingdoms in China), and there is also a theory that it was depicting a struggle for power between two types of ceramics, setomono and chinaware.
実際に何らかの伝承を伴う妖怪ではなく、『三国志』の登場人物である曹操と関羽の逸話をもとに、関羽をイメージした創作物として描かれたものといわれており、瀬戸物と陶磁器の2種の陶磁器の激しい勢力争いを描いたものとの説もある。