 If you liked
Shoujo Kakumei Utena
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 ...then you might like
Deimos no Hanayome: Ran no Kumikyoku
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both are dark romantic supernatural suspence shoujo shows from the 90's, both have a strong female lead as a main character which is surrounded by mystery and danger, sometimes unknown to her. both have flowers as a visual motif and greenhouse locations. they also both have characters that have regretful childhoods and childhood trauma flashbacks.