I tried searching and it seems we don't have a thread for this yet. Correct me if I'm wrong, mods!
Synopsis:
Satoru Fujinuma is a struggling manga artist with a strange power. After "bad events" happen he has the ability to go back in time and replay the event, giving him a chance to fix things. Events come to a head quickly and he finds himself reliving his childhood to solve a mystery that encompasses the past and present. While the supernatural nature of the series is important, it's primarily a great mixture of mystery, suspense and slice of life in Hokkaido.
Read here:
http://bato.to/comic/_/comics/boku-dake-ga-inai-machi-r5049
The series just started an anime, and I so was intrigued by the first three episodes that I had to marathon the manga! It's excellent and I highly recommend it. The anime seems to be doing a great job though, so if that's more your thing I'd say check it out. If you are watching the anime be aware that there may be spoilers in this thread.
Anybody else reading this? Thoughts?