I found this series to be great fun (I have the second season on pre-order); the story follows an all-girl fighter squadron in an alternative universe version of World War 2, in which it is all the nations of Earth against an alien aggressor, the Neuroi.
The most blindingly obvious aspect of the story is that no females in the alternative universe wear a skirt or trousers; the reason for this is that the Striker Units (the propeller-powered devices which attach to their legs and enable them to fly, using magic to power them; yes, I know - it doesn't bear close scrutiny!) need to to be in close contact with the wearer's legs to make the 'magical' connection, so trousers are out (although they can wear tights, apparently; and some of the girls do), and skirts would get in the way when they need to scramble, so they all walk about in their upper clothes (jacket, shirt, tunic or whatever; usually a military uniform of some sort) and just their knickers (panties to our US cousins) (and sometimes tights) on their lower body. In the story, this seems to be taken completely for granted, and there is no embarrassment attached to this. In fact, one entire episode (number 7, 'Nice and Breezy') is devoted to the girls underwear (although in a cute and funny, rather than sexy, way). Only the Japanese could do this! The pilot girls are all based on real WW2 pilots, and their Striker Units are all based on genuine WW2 fighter planes, and their weaponry is also based on real guns. It is a different, cute, funny story, and the characters and their interactions are lovable. If you can get over the tendency to have girl's knickers in about 50% of the shots, this is a really good series!