Fire Realm

The Fire Realm, known in Japan as the Plane of Fire, is a realm in the expanded lore of Magical Vacation, born from the conception of fire. According to Magical Vacation Complete Guide, ignis coins originated from this realm.

Magical Vacation
While there is little information regarding the Fire Realm, a star in Arko makes mention of it, and how he used to be a scholar of magic there before passing away. Additionally, if the Protagonist beats the game with darkness as their element, they go on to explore many realms, including the Fire Realm, after graduating from Will-o'-Wisp Academy.