You can delete your game account directly through the in-game settings.

[How to Delete Game Account]
1. Go to Menu in upper right > Settings > Information tab
2. Press 'Delete Account' under the ROM: Golden Age logo on the right and confirm after reading the precautions

※ When requesting account deletion, a 10-day (240-hour) grace period applies.
※ You can cancel the account deletion request before the 10-day period ends. However, after 10 days, the account will be permanently deleted and cannot be recovered, so please be careful.