 If you liked
Oniisama e...
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 ...then you might like
Kageki Shoujo!!
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Both of these shows take place in an all-girls school and highlight many social trials between the main characters as well as the side characters. Though Oniisama e... is definitely more on the darker end of the spectrum when it comes to highlighting these trials, Kageki Shoujo has its fair share of nail-biting and dark tones akin to Oniisama e...
As such, Kageki Shoujo gives me the same vibes of Oniisama e... I'd say that Oniisama e... is Kageki Shoujo's darker, broodier cousin.