11-banme no Neko wa Nene

In a society of cat-like beings, unauthorized entry by outsiders is strictly forbidden. A young girl with mouse-like features has secretly entered this territory, driven by an undisclosed purpose. She secures a job at a teahouse where she works with cat-girls who are more experienced. As she interacts with them, she attempts to understand and adopt their ways under the guidance of her senior coworkers.