If you're reading this letter, it means you've lost your memory again. This happened to you at least once before. I wish I'd had a letter like this back then, so let me tell you everything I've learned so far.
Your name is Ascensuri Cataracta and you used to be a Kingsglaive in Insomnia. About four no, five years ago, most of the remaining Glaives simultaneously lost their memories over the course of a few months. Some say it's divine retribution for our betrayal that helped kickstart the apocalypse. I still haven't found out if you were part of that or not. Some hunters found you wandering around in the wilderness and brought you here, where you've been ever since, helping restore power to nearby outposts.
There it is, that's all I know about you so far. It's up to you to learn the rest. See if you can find out when our birthday is. See if you can find someone out there who recognizes you and can tell you what you did before you wound up here.
Hopefully you're reading this letter where I left it, in your apartment. You live here with Lumen Parvum Sufficiens (the other guy in the photo) who's an amnesiac like you. You met him a few years ago while hunting. You can trust him. He'll look out for you. Unless he also lost his memory, in which case, make sure you look out for him too. He's the most important person you have — I can't tell you how many times he's saved your life by now.
Monica's your "boss," sort of, so find her and talk to her about keeping the apartment. You worked hard for it, so don't lose it now. If you need help finding your way and Lumen's not around, look for people named Nelly, Tobul, Yura, and/or Sadda. You've been hunting with them for years, and though we're not necessarily close, they know us enough to steer you in the right direction, at least.
There's a photo album on the bookshelf in case you need to memorize faces, and emergency rations in your Armiger.
I know it's tough to not know who you are, but you did it once. You can do it again.
Re: Apartment