Oh! Um, it might sound confusing, but think of it as if your money lives in there! The card knows how much money you have, and then when you buy something, you hand it to the salesperson and they'll do something with it that tells your card to send the money to their card instead. That's making it a little too simple but it's kind of like that, okay! Does that make sense? We can go to the shops and I can show you, if you want! Oh! I'm Keiichi Segawa, by the way!

["Thorough"... Yes, "thorough" is ONE word for it.]