My name is Eren Jaeger. I am a monster, though not by choice. When humanity faces an enemy, there is no need for such trifles as emotion. I learned that when I fought Annie. I still see her face sometimes—always with an arrogant smirk plastered on it, never showing her true intentions. All the horrors I've seen, all the things I've had to do—they pushed me to this point. I wanted to protect humanity as a human when I was young. I wanted to be a part of something. But I can't anymore.
I can't tell where I am right now. Probably just some town just inside Wall Maria. I still remember the day that I betrayed humanity to protect it. The place seems so similar to the ruins of Stohess. There is a faint blood stain on the walkway—probably the remains of some nameless citizen trampled or eaten by a Titan. A vague memory flashes through my head—a pair of trembling, fearful blue eyes standing just in front of my feet. They were so full of fear, yet there was that one glint of hope that I would not do what I was about to do. Armin's shout rang in my head. "You don't have to do this!" he screams. "You said we were brothers, that we would redeem the glory of humanity together!" I had to ignore him. The sensation of bones crunching through my mouth fills my head again. I can still feel his struggling limbs pulling at my jaw as a snapped down. There was a faint taste of salt—probably from his tears.
I ate Armin. I did it to sever all my bonds to my humanity. I learned from Annie that if I wanted to be the weapon to save humanity, I had to become a monster. That's what I did. Mikasa had stared at me in shock. I knew she was going to be fine. She didn't need me, and I no longer needed her protection. Levi made as if to attack me, but Erwin pulled him back. Erwin understood the sacrifice needed to save the human race. He had gone through the process of dehumanization himself—he learned to use his men as pawns in a game of chess against God himself. I had decided to play my own game.
With the taste of Armin still in my mouth, I climbed over Wall Rose and ran. All I thought of was killing Titans. Punching, kicking, tackling, destroying, devouring all that stood in my path. It's been 2 years since then. I can't really remember what it was like being human, especially after years of nonstop Titan hunting. This was my sole purpose—to destroy. Always I had to go for the kill. This was my way of saving humanity.
I wander around the abandoned town, looking for any Titans for me to devour. The town seemed oddly familiar, accompanied by the most peculiar sense of déjà vu. I had already long forgotten what significance it had to me. My reverie is interrupted by the loud crashing of stone masonry. I turn around and see a 20 meter class Titan. It was bald, but had large bulging eyes and a stomach that sagged to its knees. Inside my Titan body I grin, and I run toward the 20 meter class readying myself for a meal. But before I can reach it, I hear a soft whir. A clocked figure swoops in and cleaves a clean sliver into the Titan's neck. The Titan falls, and I skid to a stop. I see the figure land softly on a building nearby. The figure lifts her head, and it's Mikasa.