Rintaro Okabe, the Mad Scientist and after being able to crossed different world lines, had successfully arrived at the right timeline he had aimed, whereas both Mayuri Shiina and Kurisu Makise is alive and everything is peaceful. But because of his exposure to the different timelines the memories from his brain starts to overflow which triggers his sometimes disappearance and in turn, might dangerously erase his very existence. 

Now its up to his friends to help him and uncover how to stop the mad Scientist from being erase from their timeline.

Unlike the Series, this movie was not that confusing and the story was laid simple. But still I recommend watching the series before going through with this movie. I kinda felt that this was more dramatic and they perfectly shown the character's real characteristics. The ending was a little bit confusing and I questioned myself if I understood the story! but overall, this was nice and must watch if you have watched the series.

8/10 - Great