Although it is a shoujo genre, it gives a josei vibe off. Nekoyama is a masked classmate who can turn into a cat whenever someone kisses him either accidentally or intentionally. So he was wandering around as a cat and found itself Erica's house and she adores cats. That's why she saw the cat that looks her from the window and took the cat inside to pet him. While playing the cat, Erina kissed him and happened to learn his secret. That's why nekoyama had to monitor her as staying her home. That's the gist of the story. Overall it overflows with adorableness and fluffiness. They make a lovely couple.
Neko to Kiss