Eren sat on the floor of the males' dorm, gripping a piece of paper tight in his hand. Next to him was a pile of similar folded-up paper, stacked messily. The room was dim in light, though it wasn't too bad - the beds were all laid about in symmetry, across the wooden floor the room was made of.

The Survey Corps had just finished their 60th expedition beyond the walls - and while most have claimed yet another chance to continue their lives, a lot of them didn't. They were sacrificed, dead. Their lives were taken and devoured by those larger beasts that haunts each soldier's dreams ever night: the titans.

And one person, one person whose strength could top many others, was not found. She was gone, completely, without a trace. Not a drop of her blood was discovered, not even a part of her body was retrieved. It was as if she vanished into thin air, not even a sign of her being eaten by a titan.

She was Eren Jaeger's adopted sibling; she was Mikasa Ackerman. And the pile of paper sitting next to Eren? They are her's - her's, meant to be given to Eren. When she wasn't with them when they returned from the expedition, someone had found these letters under her bed in the dorm; and were delivered to Eren by Levi himself, who, while showing no emotion, bears a heavy heart.

The boy held the paper tight, sighing before opening to reveal it's content - on the cover read the name of the recipient and the date it was written, and as for this one, it seems to be written back when they first became trainees, which was years ago. He slowly and carefully eyed the letter he held, before reading it out to himself.

"Dear Eren,

I don't usually write to people… especially not you, because since you're my brother, I don't have to write to you to tell you anything, I could just tell you everything right anytime. But since mom died… you… you've been so different. I guess you're doing this for the best, so I'm not going to judge on anything. So I've decided to write to you, so I could tell you everything that happens, and everything that you miss out, okay?

Today was the first day of our training, wasn't it? You did well, I promise! I'm sure there's a reason why you kept falling - there should be something stopping you from succeeding. And… while I cannot help you, I hope someone could, eventually. I know you'll become a great soldier, greater than anybody in our unit, greater than even the greatest out there.

Remember when you were so determined to join the Survey Corps back then? I understand why now… and I'm not going to stop you anymore. No… in fact, I'll follow you there, too, if you haven't changed your mind on wanting to join that division. So please… don't tell me otherwise. I don't want to lose another family member of mine. I want to stay as close as I can with them. I want to be with you, Eren. You're the only family I have left. I will do anything for you to be safe.

I'm sorry that I sound clingy, I'm sorry that I sound annoying… but I'm selfish. I have nothing left to live for, but you. So please, let me protect you Eren. That's the only thing I could think of when I see you in trouble, I don't know why.

Also, I don't know if you noticed, but I cut my hair as you've told me to. I don't know what to feel about it, but I guess it doesn't matter anyways. Don't worry, I'll keep the scarf secured with me no matter what happens. And when the day comes that you need it back, I don't think I'll hesitate to return it back to its owner.

I hope you will be well with the training days that will come day after day - while you are training to be one of the very best, I suggest that you don't push yourself too hard. If you get sick, then how are you supposed to train after that? I know you're strong, but if you can't do it… don't.

Remember when you saved me when we were kids? I… while you told me to not ever to think of it again, I want to think of it. Because it was the first day we met, the first day you gave me this scarf, and the first day.. someone saved me from death. Someone taught me something very valuable.

I promise I won't cry anymore when I think of parents. The past stays the past, no matter what we do, it has already been written with ink that cannot be erased. So… I'll move on from it. Because now, I have you.

Thank you Eren. I owe you my life, so now it's yours. Use it for your own sake, I don't care what happens to me. No matter what, I know it is worth it. I know that this is something I could do to repay the debt I owe you from those years ago. Don't worry, I'm not doing this just for you. I'm doing this for myself too.

If it wasn't for you, I wouldn't even be here today. It's not a joke; I wouldn't have thought of the military if it wasn't for you. Of course, it was a choice with no regrets. So it's not your fault that I'm here, don't worry. Just promise me that we'll do this together; you, me, and Armin! We're going to be the best soldiers among everybody else!

This is my first time ever writing to anybody, so I'm sorry if I sounded like… I don't know, bad. As if you're ever going to get to read this anyways… I'm going to bed now, goodnight Eren. Take care, and prepare for tomorrow!

Mikasa Ackerman"

Eren slowly folded the paper back through the faint lines, bringing it to his heart. He held his tears back well, but his eyes were shiny, noting that water has already tried to force itself out.

"She… why didn't she just tell me…" he whispered to himself, placing an arm on the forehead. "Nothing else to live for, eh." he laughed emotionless. His eyes fixated on the ceiling of the room, as he put the piece of paper on the other side, gently. He positioned himself more upright, eyeing the fresh pile of paper on one side.

"She just kept… she." the words couldn't escape his mouth, caved in and unwilling to be let out. He couldn't describe what he had just read, how the girl that wrote it would waste her own life for him. She was not even blood related, she was just a girl he had met when he was nine.

Just a girl… that he had saved when he was nine. "I promise, I promise." he sighed quietly, remembering the last few lines of her note. He smiled softly; she had an ambition that clashes with his, only hers was much different, much more selfish. Much more… focused, on him.

His faced returned emotionless as he fished out the piece on top of the stack, written on the date that cries their training days. He stared at the paper. What would she have written this time?

(A/N: Mikasa was 13 when she wrote this letter, or that is what I assume. It sounds kiddish, because while writing this, it was kinda switched to my perspective of her feelings towards him.

Next chapter comes out either the next hour, or tomorrow, or Monday.)