Fate Grand Carnival

You are in one of the Chaldea office rooms, doing your work as usual. A few hours later, you hear an argument between Servants outside the office, in the halls. They... sound very familiar to you. When you go to check who they are, you see your senior, Gudako. She's feeling her wallet as if searching for something Gudako: I feel like I'm saving money for my gacha needs... But where did I save it..?