Overview of Google Play Services | Google APIs for Android
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Google Play presents people with personalized collections of apps and games, based on criteria such as the user’s past activity, actions they’re trying to complete, location, and major events. These collections are curated automatically as well as by the Google Play editorial team to ensure they include the best apps and games on offer.
When you sign in to your Google Account, you can see and manage your info, activity, security options and privacy preferences to make Google work better for you. You can review and adjust some privacy options now, and find even more controls if you sign in or create an account. No, you would have to buy a Japanese Google Play card for it to work in the JP store. Gift cards don't work in other regions' stores. I'm pretty sure Japan Code Supply (where I get JP iTunes cards) will do Google Play.