This is an origin story of Miyu, one of the main characters of Fate/Kaleid. Story-wise is a great movie, although the actions scenes are also fun to watch.
My main issue with this, however, is the horrible pacing. This movie is only 90 minutes long and yet it felt like I was watching it for 3 hours. It takes too long to introduce the real plot, the plot itself is rushed and at the end it keeps dragging itself, not knowing when to stop.
I still recommend this movie to anyone who likes Fate and has watched or plans to watch the Fate/Kaleid alternative universe. It's a 7/10 from me.