 If you liked
11-nin Iru!
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 ...then you might like
Terra e... (TV)
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Both are sci-fi shojo from the 80s that take place in space. Terra e... is more epic in the scales of setting and time while They Were 11 takes place in a single space ship with fewer characters over the course of less than 3 months, but space, drama, and mystery all take the stage in both series.