Anime with a love triangle between hostile rivals?

Looking for a show that has a love triangle where the two rivals hate each other.( And MC actually picks one) A good example would be Haganai because Sena and Yozora actually resented each other. While a bad example would be Snafu because Yui and Yukino were good friends.

Mostly looking for anime but if you slip some manga in here I'll take it