 If you liked
Kase-san Series
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 ...then you might like
Watashi no Tomodachi ga Sekaiichi Kawaii
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A bit difficult to compare as Sekaiichi Kawaii only has 1 chapter translated as of writing this.
But judging from that, they both seem similar to me, as light-hearted, yuri manga in a school-setting with a rather fast pacing. Already in the first chapter of Sekaiichi Kawaii you could see that this will go past normal friendship, I feel.