I'm looking for a shojo where two rivals falls in love (or at least they actually falls in love, but they both deny it, because they have too much pride)

something like
Beauty Pop
Special A
Kekkaishi
From Erotica with Love
thank you~

Ha, so I'm not the only one to type Eroica as Erotica! XD
Kare Kano is the most obvious one I can think of.
Kodocha, too, although they aren't as much rivals as they are enemies in the beginning.
Oishii Kankei is a bit more of a stretch... although Momoko

eventually falls in love with a rival chef , they always had a good relationship.
Cardcaptor Sakura: Before they fall in love with each other, Syaoran and Sakura were rivals in love for Yukito.

Well, Dorian is pretty erotic... Much to Klaus's discomfort. 🤣

This is a fun topic! Lessee...

Beauty Pop sorta counts, because even though the girl doesn't consider them professional rivals (she doesn't even care!), the guy does. And he's got the massive ego thing going on - can't admit he's in love with her. 😀