Fire Emblem if: Niberungu no Hokan (ファイアーエムブレムif ニーベルングの宝冠, Fire Emblem if: The Crown of Nibelung) is a manga that depicts the story of Leo, the second royal prince of Nohr. It is a side-story to the game and it seems to follow the path of Birthright. The Avatar is depicted in its female incarnation.
It makes some references to other material related to Fire Emblem Fates, such as the drama CD. For example, it mentions the Clarkenstein villa within the imperial palace, where the Nohrian Royal Family officially resides.