I am currently re-watching Ookami Shoujo to Kuro Ouji, I thought this was really cute and romantic, despite being a tsundere.
The only thing I didn't like was the classic "You don't really like me" line.
I like how romantic this anime turned out to be, it was really cute, starting from the beginning when they both disliked each other, where one of them was a tsundere.
It was really cute how they began to like each other but one of them tried to hide it for a while, and secretly began to get jealous.
This anime was just one of the best animes I've seen cute and romantic, I don't really know what else to write, I don't want to spoil too much! ^-^