Shakugan no Shana Movie is basically about the first few episode of the 1st season of Shakugan no Shana, shortened into an hour and half movie. Best watch this BEFORE watching the 1st season. As watching the anime before this is almost like a recap of it. There are some irreverent parts of the movie along with the lack of bgm on some parts of the movie as well, otherwise it's a great movie to watch.