 If you liked
Kanojo ga Kare ni Ochiru Wake
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 ...then you might like
Namaikizakari.
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I find the first oneshot and of this collection and Namiakizakari similar because it involves a male kouhai falling in love with an older female sempai that is already in love with their president of their club (that both have girlfriends). Both females also find themselves falling in love with their kouhai. However, Kanojo ga Kare ni Orichu Wake is a oneshot and Namikizakari is an ongoing manga.