This is a fantastic anime/vocaloid music video that tells a complete story about childhood friends, sudden trauma, the pain that follows from misplaced blame and the overwhelming desire to change your past mistakes. The music video has a run time of 4 1/2 minutes, but not a single second of that time is wasted, nor is any additional time needed - it is precisely as long as it needs to be. In my opinion, this is both one of the greatest pieces of anime style art ever made, as well as one of the greatest music videos ever made. A must watch (over andover again) for everyone.