 If you liked
Marie no Kanaderu Ongaku
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 ...then you might like
Garden
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Except from being from the same author, both are surreal fantasy dramas with very similar imagery (style is very artsy and unusual in relation to most manga, an alternative to vast majority contemporary manga art). Garden is collection of short stories, while Marie is one story, if you are interested in reading more alternative manga and you liked one of them you might be interested in reading another.