Please be as specific as possible when letting us know what is missing or incorrect. For example, say "this game's trophy difficulty should be 8/10", with a link to a website corroborating this difficulty estimate (if possible), not "this game's trophy difficulty is wrong".
A special mission that gives you a weapon useful in the early part of the main game. Additionally, if you complete it, you will also get Edy from the original Valkyria Chronicles as a playable character!
This mission can be played after unlocking the Headquarters in Chapter 2 of the main story. To access this mission, go to Book Mode Menu Extra Stories.