Does NOT contain spoilers(there is a version that does contain spoilers, in a few paragraphs, for the people that have already watched it) :
*Story* 6.5/10(if only I could rate it 6.5/10 officially...) :
The ending is "meh". In fact it is so "meh" it was worse than expected.
It does conclude the story, but it does not satisfy the people who watched the whole anime.
*Character* 7/10 :
Very unrealistic. Everybody that supports the main character is overwhelmingly nice...
The protagonist is too immature for a 29 year-old. It would've made more sense if he was a teen. The only character that gets a decent amount of character development is Kaya.
*Art/Sound* 8/10 :
The character artstyle isn't generic. I personally like the ending theme's first part's melody(before melodic development).
*Enjoyment* 7.5/10 :
Until episode 8, you get constant suspens, and tension. Thus if you watch all episodes in a row, you won't realize how the plot has many flaws. After episode 8, it gets relatively more calm. The main problem was solved, thus you won't give much shit about the other problems.
The last 2 episodes, I would rate them 5/10. They're conclusive, but not really satisfying.
SPOILER INCLUDING VERSION ALERT
Story : The revival isn't given any explanation. Unbelievable. They should've made the series a little longer and found better scenarists.(idk if the anime is conform to the manga, but that does not really matter. If it is, then the manga's scenarist was quite mediocre at doing his job.)
Character : The protagonist is irrational; he runs away from the crime scene(of his mother's murder) for no accurate reason... When I first saw this I thought he was traumatized because it was a déjà vu or something. When Aya says "Mimicking a superhero is childish"(sorry for bad graduation) he gets confused out of nowhere and doesn't find his words... What the... Kenya is too mature for a 11 year old(at first I thought it had something to do with his parental education, or heck, even revival, but the scenarists didn't take the time to make Kenya look rational), though that's questionable.