This movie is just fucking awful. If you have seen the anime series get ready for a hoot cause you will still not understand it UNLESS you've read the visual novel too. The issue with this is that the movie is unforgiving in this aspect to those that haven't done both. Transitions are weird as hell as it jumps time throughout the film. This can be very confusing as it tells you the story is going into the past, but really you're heading in the future.

The problem with time lapsing in any story is you have to have a fixed present to do so. To start off the movie and say "6 months ago" well 6 months from WHAT?
This is a huge problem and the issue doesn't stop there.

There are new plots in the story obviously, but it doesn't tell you anything about what they are. Once again you're forced to rely on the visual novel and the past anime series. The reason being is it jumps between the two for it's explanation. So really you're watching a recap that says nothing.

The dialogue is so weird and abstract that it makes it hard to follow. Characters will be talking about the grail war, but instead they'll transition into a completely unrelated topic or someone will interrupt with nothing to say. The plot is hard to follow as no one really says anything to explain what is happening. Anomalies occur consistently and no one will explain a thing about it. They will acknowledge it is happening, but say nothing to give the audience an explanation of what it is that is taking place. It's like if someone puts a rock in a glass of water and it just sets itself on fire and the characters will acknowledge that it is amazing, but not explain what did it or why.

This movie is also part 1 of 2 by the way.
The animation is amazing and the fight scenes are awesome, but it is not worth investing into watching the entire film. Just youtube the fight scenes cause it isn't worth the ticket money.