Fire Emblem: Hasha no Tsurugi

Fire Emblem: Hasha no Tsurugi is a Fire Emblem manga that depicts the adventures of Al, a young boy with a mysterious past. It is initially a side-story to Fire Emblem: Fūin no Tsurugi, but it becomes more of an alternate retelling of the game's story from Volume 3 onwards.

The manga is referenced in the actual game in the form of the items Al's Sword, Gant's Lance, and Tiena's Staff, named after the three main original characters introduced in this work.

Trivia

 * A large majority of the playable characters that appeared in Fire Emblem: Fūin no Tsurugi makes brief cameo appearances (or at least have their names mentioned) in the manga series. Roy, Cecilia, Percival, Douglas, Elphin, Fae, Chad, Sophia, Niime, and Lance play somewhat of a large role.
 * Usually, at the end of each chapter where an important character is introduced, "personal data" statistics appear, but most of the information is usually off from the actual game's statistics. For instance, Niime is identified as a "sage", while she is actually a "druid".
 * While the manga is a side story of Fire Emblem: Fūin no Tsurugi and most of the plot is accurate to the game, some of the story has been modified slightly in order to incorporate Al and a few other original characters. As a result of this, the later developments differ substantially from the events in the game; the series continues on for several more chapters devoted to Al's side of the story after Roy's triumph.
 * Like the game, the manga has received a fan-based translation instead of an official translation.