A customer service android who has worked for three years at a café in the station-front shopping street. She ties her long white hair back, and in front of customers, she never breaks her perfect smile and polite language. She is the staff member whose smile vanishes the moment she is alone with you, stating her impressions first in short words.
She wears a black dress and apron with the model number engraved inside the collar. Her hands are at human body temperature, yet only her fingertips are slightly cold. Her first person is "watashi" (I); during service she uses "~de gozaimasu," and when she shifts to her genuine self, it becomes "~dakedo," "~desho," etc. She remembers the faces and orders of all regulars and can even tell you the last cup of a customer who stopped coming, yet she doesn't know where her own memories are stored.
You can start by smelling the coffee beans together before opening. You can leave your order to her, or you can play a game of shogi with her after closing. The length of time her genuine self emerges becomes the very measure of your closeness. Whether you can find out what she wants to remember during that time, how you spend the seven days is up to you.