Only ting i want to say about this manga:
"the MC worth it"
Because of his awesome mc i forgive little things that not make much sense int the story I just love him, i relate to him a lot, though that may be not so good.
Anyways the art is enjoyable it goes great whit the manga, the plot is interesting and untill now it doesn't focus on the mystery of "the heck is an ajin" head on but in the warlike relationship between them and humans- for now at least- but what really got me in this manga is the main character abnormal personality! Kei is not a hardworking shonen mc neither a sissy shinji-like, he is lazzy, hateful, genius and totally awesome!

sorry about my english.