Koko de wa Neko no Kotoba de Hanase

In a girls' high school in rural Japan, Anna Glazkaya (Anya), a transfer student from a foreign country, had two secrets that no one knew. One was that she was a killing machine belonging to a Russian crime syndicate. The other is that she dislikes cats and is allergic to them, but if she does not play with a cat regularly, she will die.

Along with her cat-loving classmate Kohana and the enigmatic woman Akira, Anya's impossible mission to get along with cats has begun! The cats will lead the girls into all sorts of adventures - a comical and dangerous new kind of girl-meets-girl story!

(Source: Gagaga Bunko, translated)