The Old World (旧世界 Kyū sekai?), or in out-of-universe known as the Floweverse (花宇宙 Hana uchū?, Lit. "Flower Universe") is one of the three primary universal settings within the Crossverse. The Old World is the location of magic and other ancient magical natives, serving the plane of existence to Earth Land and everything that encompasses within Patria.
In the Crossverse, the Old World is the term used by the New World which proceeded before it, destroyed by the event known as the Apocalypse. However before this event, the Old World was a rich and cultured world filled with many empires, kingdoms and Republic nations across its surface.