Speak to Louise during the first day of your Field Exercises in Crossbell to discover her admiration for all things Mishy. You’ll need to wait until you reach Crossbell itself and then head to East Street to find a stall outside of Neinvalli Exchange selling Dried Salmon. Pick up two of these and take them into Neinvalli to exchange them for the Retro Mishy Strap. Wait until the afternoon to find Louise outside the Derfflinger and hand them over to obtain her Character Note and 3000 Mira.
Join Rean on an adventure through Erebonia, where you'll embark on new journey as a Thors Branch Campus Instructor. Here you'll explore many locations, face old/new enemies, and find many treasures that give you an advantage in battle as well fancy clothes to help you look the part.
The guide for The Legend of Heroes: Trails of Cold Steel III will include all there is to see and do including a walkthrough featuring where to find all Side/Branch Campus Quests, Chests, Books, Cards, Recipes and more. Including in depth guidance on how to beat every boss as well as how to solve and conquer all dungeons.