I wrote this review because looking back at this manga, I have fond memories and wish I could erase my memory so I could read this gem again.
Positives: Characters feel so realistic and relatable. You watch as everyone is finding their own way to live in this post-apocalyptical world. Sometimes you may look at a manga and cringe because of it being overly edgy or its just so unrealistic, but with this manga perfectly portrays the characters so I can empathize with them. Very few manga have been able to portray such deep and contrasting emotions than this. One chapter I can feel bliss and content, while a few chapters later I feel deep despair unlike I've ever seen done in a manga. The art isn't anything over the top, but is perfect at portraying emotion. The ending was great and didn't leave me feeling like shit, but with a hopeful message. I just love the themes in this manga and the moral questions it inquires.
Negatives: Not very many bad things I can say about this manga. The only real thing that keeps it from being a 10 in my eyes is that some of the parts towards the start of the manga felt a bit too slow. I also wish there was a bit more to feast my eyes on, such as more about the boy before we met him.
Overall: If you like deep, emotional, realistic, character driven manga, than you will love this. If you are in for a complicated overarching plot and lots of action, than go read AOT instead.