Information for public disclosure:

Because of the fact that titans do not hurt nature, the wall is built by trees to protect the people in them.

The bells were ringing, the people were crying. Because they knew that ringing will only bring a new mission outside of the tree-wall. And another mission outside of the tree-wall, would only mean loosing for the vanguard corps.

Street near the wall-gate was full of vanguard corps, and crowds of civilians ready to say goodbye to their children getting into the mission outside of the tree-wall. There in the crowd, there was a child proudly waiting for her moment to wave her hands, to the lost heroes. 

“Come back alive!”, they probably heard me, this is so exciting.

“What are you saying kid?”, asked an old man with a rising tone.

“We need to encourage them, don't we? How will they be able to know more about the outside world, and how titans work?”, of course we need to encourage them, my brother always says that “Encouraging words can produce big results”.

The old man just looked at me, and laughed.

“Why are you laughing?”, what is he thinking?

“Are you so naive? Believe me this is an old played song… Half of them won't even see the light of another day, and encouragement won't help them. Half of them will die, and that's where our taxes are going…”, he must obviously be bluffing.

“That's nonsense! My brother is there!”, I am curious about what he will say to that. My brother came home every time… He promised me.

Slowly as he started to smurk, my nerve was rising. But I will show him, “And what do you mean by that?!”, I shouted.

“Nothing, I just understand now that you're one of those who would rather die outside the wall, than live in peace here… Because of shits like you, we're poor, and humankind is dying. So tell me kid! Would you rather die and be eaten by a titan?”

I was shocked… What is he thinking?! We wouldn't be at this point of knowledge without the vanguard corps! “I would rather die, outside of the tree-wall, and see the sea, than wait here as some drunk pig for my silent and meaningless death!”, oh no. Everyone is looking at us…

“Kid, are you nuts?!”, he's apparently angry. “I'll show you!”, after he could end the sentence, his hand was slowly getting bigger. No… His hand was reaching my face. At that point, it felt like time stopped… I saw my end. I saw myself in a prison, for spreading misinformation… I shouldn't say that one with the sea. What was I thinking? Of course it was a bad idea to talk about something so tabu as “something that is outside of the wall", inside this closed minded society. 

Out of nowhere, a young girl appeared, while the old man's hand was getting closer and closer, a girl's hand reached the old man's hand, and stopped his hand from hitting my face. “So now you're bullying youngsters? Why don't you find someone on your level, old man?”, the old man stopped. A fear appeared on his face, while his hand was getting redder and redder.

“L-let me, o-out!”, said the old man. “What? I didn't hear you… I heard only moaning.”, said a strange girl with full confidence.

“Open your hand!” shouted the old man.

“Only if you will leave this girl alone!”, said strange girl with the strongest voice, I have ever heard.

“I will, I will! Just open it!.” said the old man, while his nose was getting bigger, redder, and his eyes were getting wetter. The strange girl opened her hand, and the old man fell on his knees wrapping the red wrest of his hand. “Get fucked!”, shouted the old man, while running away.

“Thank you… You saved my life.” without her I could already be in the local hospital.

“Why do you want to join the vanguard corps?”, asked the strange girl.

“What do you mean?” if she listened to our conversation, she should already know why I want to join… “If you can't even defend yourself, how do you want to become one of the vanguard corps?”, she said. I stared. I can defend myself, right?

“I'll try to train!”, I shouted.

“Well good luck with that!”, said the mysterious girl, on her way to leave.

“Wait!”, I shout, “I don't even know your name!”.

“It's Nifa”, she said, and entered another street. 

After my brother comes back from his mission, he needs to train me, so I can join the vanguard corps as him! That's my plan for now…