Kei Sambe

Struggling manga author Satoru Fujinuma is beset by his fear to express himself. However, he has a supernatural ability of being able to prevent deaths and casualties by being sent back in time before an incident occurrs, repeating time until it is prevented. One day, he gets involved in a catastrophic affair that turns him into a criminal. Desperate to prevent the incident, he gets sent back in time only to find himself as a grade-schooler. (imdb)

The live-action version of a manga and anime story about a young man who is constantly transferred back in time right before something life-threatening occurs, and attempts to use this ability to find out what happened to his old missing classmate.