They’re not quite “enemies to lovers” more like rivals to lovers , but here goes nothing:
Eensy Weensy Monster
https://www.mangago.me/read-manga/eensy_weensy_monster/
Beauty Pop (a little longer than your request and the romance is practically nonexistent, but there was a rivalry mainly from the ML)
https://www.mangago.me/read-manga/beauty......
