No. 6 emotionally scarred me, both the novels and the anime. It was such a great whirlwind of emotions and morals and I cried and laughed countless times. It's definitely recommended if you're looking for a short anime, it's only 11 episodes, and if you're looking for some novels, you can also try No. 6 out. It was a great Sci-Fi and they threw in so much allusions and had tid bits of humor here and there.
Not to mention the eNDING. THE ENDINGG
I was skeptical about uploading this at first because the end result didn't satisfy my 100% and there are a lot of mistakes, but I spent 15+ hours on it, so I might as well ;w; Done with Copic markers and Micron pen. I took a freak ton of pictures, so maybe I might do a walkthrough of it >_>
Edit: Thank you very much for the DD!