[ They can talk more about books after the important things are settled. ]

Yes, this. It serves as your identity card here. Please don't lose it. [ Getting a new one is quite a hassle, too. ] It's also a credit card - it carries your virtual money so you don't have to put bills in a wallet.

[ Personally, he preferred paper money, but oh well. ]

You get a free house here, too. That card will be the key.