 If you liked
Noir
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 ...then you might like
Blue Drop: Tenshi-tachi no Gikyoku
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The main character of Noir is an amnesiac, somewhat similar to Mari-san from Blue Drop. Both the leading heroines have a slight yuri interest in one another.
Blue Drop has scifi as a second genre, Noir is a girls-with-guns,adventure type of genre but they both share a mystery/suspenseful subgenre/ending.
The central alien race in BD are all female, while Noir has extraordinary female leads, enemies and characters.