The Go-Touban series has always focused more on the sisters and their relationships with each other than it ever does with the actual romance plots. Each of the girls has gotten sufficient development over the series (although some are better developed than others), and that's still the movie's main focus and where it excels.
However, this had no right being over 2 hours long - a sign of poor planning and shoddy editing. Additionally, the animation & art, while colourful, is somewhat lacking for a movie production and ends up looking incredibly mediocre.
