 If you liked
Hana yori Dango
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 ...then you might like
Kyuukyoku Venus
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Two stories about a girl that - against her own will - gets sucked into the world of the rich. There are also lots of unrequited love.
Don't think these stories are alike though. This recommendation is for the people seeking the same elements. HYD is longer, and therefore it has more depth and drama.