 If you liked
Geten no Hana
|
 ...then you might like
Shinobi, Koi Utsutsu
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Both are manga adaptations of pretty popular otome games, so they have a similar atmosphere in terms of the romance, and both of them are also about a female ninja and a bunch of male ninjas.
Honestly, I'm writing this because I was trying to remember the title of one of them, and I kept finding the other, so, in terms of subject matter, I'd say they're pretty similar, even if only superficially.