 If you liked
Gunslinger Girl
|
 ...then you might like
Dívčí Válka
|
Both series have a focus on a young female protagonist(s) fighting against a large antagonistic group and their primary weapons are firearms, and a very large cast of characters.
The focus is somewhat similar in the sense that all the fights are politically driven, and each fight is shown to have a lot of strategic prep work beforehand, along with the fights being much more grounded in reality, no fancy shonen powerups or whatever.
If you enjoyed those aspects of Dívčí Válka you would enjoy Gunslinger Girl just as much.