I think that everybody knows what is this manga about. I don't think that i have ever read anything better and the roller coaster of emotions i had while reading it is amazing. The autor Hajime Isayama really thought about everything before he even wrote the story. Everything makes sense and there are a lot of plot twists. I also don't think that i loved an art style as much as this one. If u like reading mangas and watching anime (if u don't know this manga has an anime adaptation) you'll love it! i highly recommend it and the ending is so painful and yet so beautiful. I don't think that i'll ever see another manga or anime as good as this one.
Shingeki no Kyojin