Hi there! I understand that you want to remove all the data accumulated on the Vita Mahjong app. Let's go through a couple of steps to help you with this.

### Step 1: Delete the App Data
Unfortunately, on iOS, you cannot individually clear an app's data as you can on Android. The best way to remove all data would be to delete and reinstall the app. Here’s how:

1. Delete the App:
- Locate the Vita Mahjong app on your iPad.
- Press and hold the app icon until you see the option to Remove App.
- Tap on Remove App and then confirm by selecting Delete App.

2. Reinstall the App:
- Open the App Store on your iPad.
- Search for Vita Mahjong.
- Tap the Download button (the cloud icon) to reinstall the app.

### Step 2: Restart Your Device
After reinstalling, it's a good idea to restart your iPad to ensure that any cached data is cleared. This can often help with performance and app behavior.

If you'd like to keep any specific game data, like progress or achievements, be sure to check if the app has a backup feature you can use before deleting it.

Are you satisfied with the solution I provided? If you need more assistance, feel free to ask!