Detective Haika

A story about people surrounded by walls. Living in fear of titans. I'm sure people have seen a lot of this review, so maybe this will be converted into a quick one. So when Eren, Mikasa and Armin was a kid, a collosal titan broke the wall entrance. Many titans entered the wall. One of them killed, err... one of them ate Eren's mother. Meanwhile, it was unknown about Eren's father whereabouts who happens to be in an adventure somewhere (or research).

Since then Eren, Mikasa and Armin decided to join the scouting legion and kill titans. Many of them are eaten, including Eren. Then everyone find out that Eren didn't die, because he could turn into titans. He protected Mikasa and destroy the titans. Later, Eren was in court. Whether he should be handed to survey corps with Rivaille like he wanted to, or to be handed to military police and get killed. Eren ends up being in the survey corps, and so are the others who followed him to survey corps later. In process of capturing female titan, many of Rivaille's squad died. And the female titan eventually ran away.
Soon, they doubt Annie. Armin pretend to ask for Annie's help to hide Eren until they are in safe place, while Jean disguised as Eren and pretend to be captured. It was an ambush for Annie. But she managed to turn to female titan and fought Eren. She lost and was frozen solid. In the manga, it was already told that the other titans who appears when Eren was a kid were Bertolt and Reiner as the collosal titan and armored titan. In the OVA, it was revealed that one of the Rivaille's squad escape because her city was attacked by titans. She ran as fast as her legs would carry her and keep writting her journal every details. And then, she met a titan lurking in the forest. The titan talks and it thought she was someone else. She kept writting her journal until her head was eaten and her body was put in a tree. Rivaille squad discover her journal, and Hanji Zoe make it as a proof that it's important to investigate titans more.

I don't know which option you should choose. I could never advise you on that... No matter what kind of wisdom dictates you the option you pick, no one will be able to tell if it's right or wrong until you arrive to some sort of outcome from your choice. The only thing we're allowed to do... is believe that we won't regret the choice we made.
~Rivaille