Very nice thriller/mystery anime. Based on the manga with the same name written and illustrated by Kei Sanabe, was animated by A-Pictures and directed by Itou Tomohiko (both known for their work on SAO, among others). It has an interesting plot well executed and developed throughout the series but very poorly presented. We don't get to know anything about Revival. How did it appear? Who gave it to Satoru? Also, the characters don't have a very detailed personality or a deep background, but that's kinda forgivable since most of the characters are just school kids. Of course, there are some characters very well designed. A detail that I really like is the red jacket Kayo usually wears (because of the color meaning) and how it is related to her life and past.

The soundtrack is one of the biggest pros of the series, using classical instruments to represent such themes as loneliness, happiness, fear, devastation in a brilliant way. It certainly generates emotions in the viewer, and helps the plot a lot. The opening is a great song that fits very well with the environment as well as the ending. The seiyuus work is pretty good overall, but I would've liked to feel a little bit more from the lead actor. It was a little bit expressionless to me, mostly in Satoru's adult phase. But again, it is somewhat forgivable as it was his voice acting debut.

The art caught my attention very much; the pale and soft colors suit the atmosphere of the story perfectly and I really can't imagine anything different. The direction in general seemed quite neat to me, and left quite memorable scenes thanks to the direction/animation rapport.
However, with all that said, I've to admit that the main plot twists throughout the series were quite predictable, and as the chapters went by my suspicions became practically a hidden truth.

The series suffers a lot with the lack of development in some themes like the time travel, which I already said before, or in the characters' actions. The first episodes are quite filling, they give you a sense of satisfaction when watching them, but from there the segments that should be determining for the plot feel very rushed or lacking in detail.
The biggest issue I find however is the development of the characters: Satoru is a 29-year-old man, mangaka wannabe, who shows indifference towards society but has a strange ability of going back in time some minutes every time a human being's life is threatened. Sounds weird, doesn't it? There's also Kenya, a very clever boy to be 11, but that simply dedicates himself to fulfill a supporting role for the protagonist,not being able to solve or do almost anything despite being much smarter than Satoru.
Or Kayo, who at times feels like she's presented simply as plot bait rather than as a child, showing us the struggles she was going through. I have to say in favor of the series that as the chapters progress you can see the changes in the way she acts and how she changes for the better thanks to the actions of Satoru and the rest.

------SPOILERS ZONE!!! YOU HAVE BEEN WARNED------

Master Yashiro - who reveals himself to be the killer in the 10th episode, despite truly looking as a villain, makes many mistakes for being a killer, starting with the simple fact of why he didn't change targets when Satoru started to interfere. Furthermore, the reason why he carries out these atrocities does not convince me personally.
But not everything is negative; There are some adorable details that help make the story more moving: The perspective they gave to Satoru's actions, as if he were a real superhero, not really getting anything in return (or in Yashiro's words, getting Kayo's smile); the "are you idiot?" too or the one that I find the most important: How Kayo and Satoru use the "a town without me" differentiated by the circumstances that both lived at the time. Kayo, in the terrible conditions that she found herself, wrote that story as a real relief, as if it were a utopia (which it was), wanting it to happen, trying to get out of the depressive spiral in which she was living. And Satoru, in the final episode, quotes those words to thank his friends, to thank them for having lived that time he lost while he was in a coma. A duality not so far-fetched that all it achieves is to move you even more

Overall, I enjoyed this anime so much, especially the first half, and it generated several sensations while watching it - I even cried at some point - but it is true that the new original ending, changing the one that the manga has, wasn't the best idea at all, because it practically killed all the plot they've built up until that point with a really flat scene in the rooftop with only Satoru and Yashiro. Thhe development Satoru had with the other people after the coma got lost in the anime as well. Thanks to this, many people really thought Satoru and Kayo should have ended up together, when in reality that type relationship was never destined to exist between them. Satoru's and Kayo's relationship goes further than just an affective one, it's a relationship between two people that overcame terrible adversities thanks to each other. It is almost surreal, but the scene with Kayo's baby shows that. If they only would have animated all of Kenya's scenes or even just allign Satoru's thoughts with the manga this overreaction towards Kayo and Satoru not being a couple could've been easily avoided.
However, despite how poorly they treated the finish of it, the anime's definitely not bad at all. In fact, it is pretty good, but it's true that the anime doesn't reach its full potential at all, and if only they would've treated the last episodes better, it would be a great great work.