 If you liked
Alien 9
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 ...then you might like
Mahou Shoujo Madoka★Magica Movie 3: Hangyaku no Monogatari
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Both series are a dark turn on the cute and moe genre that goes badly for the main characters, who are in both shows young girls. Both have a weird structure and plot twists and have unsatisfying endings, so its very likely that you will apreciate the other if you enjoy one of them. Also they are both extremely well done and dont give a damn about what the audience will be expecting.