First, let me talk about what people usually complain about, the animation. As you can see I gave it a 9/10 instead of a low score. This is because I think this 3D animation style is a refreshing change to the normal 2D animation style. True, it's a bit lacking and I think it's because of the time required to do it in 3D rather than 2D. It gets better later on though. I myself thought it was disappointing at the beginning however after 13 episodes I have gotten used to it and trust me, It's not worth dropping the show just because of the animation style.
SPOILER ALERT -
The show tells of a young boy aspiring to be a 'fine human' who, due to an accident, discovers that he is an Ajin, mysterious humanoid beings that are immortal. The police takes action quite immediately, placing a 100 million bounty on him. With Kai, a childhood friend, the protagonist escapes from the researchers that uses "they are rare beings and have to be protected by the government" to capture and research on Ajins without the knowledge of the public. Ajins are used as money-making machines by companies as they are Guinea pigs to test the efficiency and safety of new drugs, technology or weapons.
To be honest, the anime is spot on about how the world would be like if Ajins existed. The police would act immediately. A bounty would be put which motivates people to search for them. Research would definitely take place with backings from the government.
I find the story very realistic and the main character, though wimpy and unknowledgable about an Ajin's power, grows and develops his skill. He has a cold personality and a lack of a sense of justice as he views everything happening to people elsewhere as 'unrelated'. Despite his lack of heroism, I think it brings more charm to him as a character rather than a classic wimpy but heroic character.
Satou is probably my favourite character. Despite his 'calm' look that an old person usually posses, he is the most BADASS character ever. "I always play a game in hard mode" how is that not badass!? (He probably played Dark Souls in hard mode and thought that killing humans was easier) He's also very clever, using the presence of media to gather Ajins to 'change' the country.
The story is well-paced unlike Tokyo Ghoul, which I watched previously, and it is definitely worth the time. I CAN'T WAIT UNTIL THE NEXT EPISODE IS RELEASED!!