How to see all the apps you've ever downloaded on an Android phone
1
Start the Play Store app.
2
Tap the three horizontal lines at the top right of the screen and then, in the menu, tap "My apps & games."
To download Japanese apps on your Android device, use a VPN. Set up a Japanese account to access the Play Store in Japan by following these steps: create an account with a Japanese email address and sign up for a free trial of TunnelBear (or another VPN service) that changes your IP address to Japan.