~MAY CONTAIN MINOR SPOILERS!~
Honestly, I only started reading Koe no Katachi because I started learning sign language. At first, I thought was gonna be a good experience read a manga that have some elements of something I was studying, and I could also be learning something to my studies. The truth is, I discovered this story was more complex, dramatic and more related to myself that I could imagine.

It follows Shouya Ishida, a guy who had been in the position of someone who've made bullying, but also was bullied by the ones who have practiced with him. As he suffered these traumatic things after have bullied a deaf girl (Shouko Nishimiya), he decided to make something to change what he have done in the past after a few years.
The interesting thing here is that the act - bullying itself - wasn't something restricted only to Shouya or Shouko, but also something that followed a lot of characters during the story, and how they share this with the others and try to find the so called peace and happiness, at the same time they try to forget it. But is this actually possible? Traumatic experiences aren't something you can simply forget or "cure" fast or without the help of someone, so the story also brings the many psychological problems the characters acquired during that time.

Talking about the characters, I think you can relate yourself with a lot of them, especially Shouya, the one who was the bully, the bullied and then the forgotten one. He also grew a lot in my opinion during the story, physically and mentally. While that, Shouko seems the strong girl, who at first seems to ignore all the horrendous things the classmates have done to her, but in the end you realize how weak she was all the time - also one of the consequences of someone who suffer from bullying.
Other characters also important to story such as Miki, Naoka, Tomohiro and Satoshi, I'll let you to read and find at your own what you're gonna think of them, since they may cause you different feelings and interpretations, but have in mind that they can also be related a lot.

Continuing about the story, and now talking about Shouko in special, I personally liked how they deal with the fact she's deaf, but in special how the family treated it, it feels very real to me based in the experiences I'm having right now, and I really liked how the author brought this theme in the manga. Had shown the reactions of kids but also adults while seeing someone like her make you have lot of feelings, but at same time make you think what you were gonna do if you were in a situation like theirs, and honestly this is something you can make in various moments in the manga.

Another thing that called my attention was in the last chapters, when they started talking about their future and what they were gonna do after the graduation, I think is very interesting since the characters have passed by some many things at this point, but they still want to be someone productive, someone that can make something for society and for themselves.

Anyways, Koe no Katachi was a very complete manga in my opinion, and I would totally recommend it to someone who likes drama and a story with very real elements; but also for people who are tired from their everyday shounen. It’ll sure make you put yourself in the place of lot of characters and think "what I was gonna do if I was in this situation?", which is also a very interesting thing.