the story is one of the best I ever watched although it might seem fast paced but definitely will leave you wondering and asking questions in real life ! , it sheds the light on the cruel reality of humans although some might see it as an extreme view but it has truth in it and at the same time it shows what makes humans special on earth and shows their beauty , totally worth more than 24 episodes .
the characters development is also fast paced but really good , you can see the changing in look along with thoughts and actions , one of my favorite characters is Tamiya Ryouku the change at the end will surprise you as it surprised me (first time I watched it ) .
animation: its not the best but its good , I think it would have been different if the theme would have been darker like Berserk for example , it would show the terror more but I think there is a reason they didn't decide to make it more dark themed maybe because the fear is not the main subject the story trying to tell , but I would like to see it in such animation .
the reason I gave it 10/10 is not the animation or the characters although some characters would be 10/10 in this short 24 episodes , the reason is the after effect of the show , I always liked the stories that have a message or an idea that makes you think about it in real life , this is one of these stories the massage is clear at the end although it might change through out the show .
