The New Girl is a Big Sister

Café Stile gets a new waitress, Miu Amano, and she's assigned to play a "big sister" character. Actually, Miu has a surprising secret that astonishes the rest of the Stile staff when they hear it. She masters the "big sister" act right off the bat, and in fact, Maika makes an effort to learn from her as a "role model" of how to masterfully interact with the clients, but it doesn't go so well.