 If you liked
Koibana: Kono Yuuwaku niwa Katenai! Best 6
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 ...then you might like
Hachimitsu ni Hatsukoi
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For the fifth oneshot (Ah! Itoshi no Caramel Boy) as stated on mal, both have the same premise around childhood friends. The only difference being in Ah! Itoshi no Caramel Boy, both childhood friends have an unrequited love, while in the other, only one of them possess an unrequited love.