Good anime that in short basically a 'Bully Prevention'. It trully we know what kind of impact bully that happen to person until there not longer there, it might be not the main reason of thier suffering but making the situation worse. Still the series is half explaining about supernatural occurence that cause it, make it hard to guess what really cause of all end of halfway phenomenon. But in the end pretty good that take a lesson open and befriend with people around you, so you can cherrish your moments day by day.