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A sci-fi kinda future with lots of big breasted girls with weapons running around either fighting eachother or big machine kinda things that for some reason attack the earth.
It's not a harem if that's what you're looking for, but everyone does kinda dig the mc because he had a sister who was famous for fighting off some of those machines that attack the earth.
All-in-all I found it a really enjoyable show to watch with plenty of action, lots of skin and a pretty decent story.
The anime is 1 season of 13 episodes. Kinda meager, but if I'm not mistaken there will be a new season next season. Also the manga is has over 300 chapters.
