How to download TestFlight
Since mikuma is beta version, please download TestFlight in advance. （TestFlight allows you to download the Beta version of the app for iOS.）
Tap “View in App Store” to open AppStore
Tap "Download" to download TestFlight
Tap "Agree" on terms and condition.
If the app is not available, close Testflight app.
Go back to safari and tap Step 2's "Start mikuma".