ReLIFE was a really good anime and so I was anticipating at least a "good" live action, but unfortunately, I didn't find this movie to do the anime justice. There were some plot points left out, which weren't detrimental to the plot, but it made the movie a bit choppy. If you haven't seen the anime, you might find it a bit difficult to follow the plot because there are pieces in the anime not included in the movie that help explain the following parts of the story.
What I really liked was how the movie included the ending for the two MC's, which the anime hasn't currently produced, so a finished story was really nice to watch. I really wouldn't go back to watch this movie just because the acting wasn't particularly good and the choppiness. Instead, I'd go back and read/watch the manga/anime if anything.