ERASED is really good. I like it very much. The plot twists are severe in that since the protagonist gets to travel back in time, he changes not only the past but also inadvertantly changes things in the future as well, but for better or worse, there isn't a certain answer. Started off as a simple intention to save a person, the story slowly evolved into a lesson for the protagonist and also viewers that every action taken will have major consequences in the far future. Even the flap of a butterfly's wing may cause a hurricane.