Fire Emblem if - Nibelung no Houkan

Fire Emblem if: Nibelung no Houkan (Crown of Nibelung) is a manga whose plot-line focuses mainly on Leo, the second royal prince of Nohr. It is an adaptation of the game and follows the Revelation route. The Avatar is depicted in her 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.