"The Poet" (詩人 Shijin) was a human from ancient times who came into contact with beings who crossed over to this world from an adjacent one, and named that adjacent world and its inhabitants the "Crimson Realm" and "Denizens" respectively.[1]
Background[]
"The Poet" was a master in the usage of words. They once encountered beings from another world who told them about their homeland, which the beings had referred to with the expression "Swirling Cathedral". "The Poet" created the names "Crimson Realm" and "Denizens" based on the impression they got about the world from hearing about it.[2][3]