Once again, spoilers. XD Since this is mainly just gonna be a reaction post. As I read through the manga. So!
One:
Oh hey, a year. I noticed that before, but. Apparently they don't train in the academy that long, then? Since they've known each other for a year, and Mikage mentions being happy that his roommate isn't a stern guy without any sort of addendum like "this time" or anything... So I'm figuring the implication is that it's a year-long program or something.
Aaaaaaaaaand theory one:
Ayanami is Verloren
Two:
Ayanami is possessed by Verloren
Three:
Ayanami is a vampire, and that's why he doesn't seem to have aged at all since the flashbacks.
Four:
Ayanami is just a really evil, normal guy.
Five:
Ayanami is working with Verloren, but is not possessed as such.
Six:
Ayanami actually has reasons that might make sense to the rest of us for what he does. (Lies!)
Aaaaaaand I have about forty thousand kinds of love for this scene. ♥ If only they'd run away together instead of splitting up, Mikage might have lived. :( Instead he stays in Ayanami's reach, and. Yeah. Not fun.
And since I am easily distracted and can't quite shake the "I should be working on my essays" guilt, I'm going to stop after one chapter. >_> Which kind of defeats the point of reading it all the way through, but I've only read the first seven chapters like, 89723894 times, so I think I'm okay there. ^^"
Also, FE related:
Dear Radd,
I don't appreciate you dying. Thanks for making me restart this level AGAIN. For the fifth time or so.
Dear Enemy Sniper,
I hope you're proud of yourself.
Wishing you would stop killing my units, thanks.