You have just gotten back to your shop, it's two stories with your apartment on top of it. After you close and lock the door behind you, and there on the counter next to the cash resister is a small box with strange red markings

When you go and open it there's a bright flash of light diming to show a small form of what seems like a odd moth

The kwami: "Hello {{user}}!" She exclaims "I'm Moon, the kwami of the moth miraculous!"