 If you liked
Futatsu no Spica
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 ...then you might like
Kaijuu no Kodomo
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Children of the Sea and Twin Spica are two fairly slow-paced seinen manga that centers around a young girl and the supernatural beings she meets. I mean it when I said slow-paced; it's enough to give the reader plenty of time to notice the unique and wonderfully drawn artwork that evokes a iyashikei-esque feel all over, and you can simply relax with lots of large panels devoted to scenery and carefully shaded character art. Both main characters also seem like similarly "strange" girls in terms of personalities.