You can check your coupons in the [Coupons・GO Ticket] menu in [Menu] tab.
(Coupons that already expired or have been used will be displayed for a certain period of time and then automatically hidden.)
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Please note
If you uninstall the application or delete your account without registering your email address and password in your account (i.e., without doing a account transfer settings), the coupons that you have will be deleted.