The monthly pass fee for the Monthly Pass is billed every 30 days based on Coordinated Universal Time (UTC).As a result, you may be billed twice within the same calendar month.
Example:
First billing on December 1 (UTC)
↓ 30 days later
Second billing on December 31 (UTC)
Please note that the actual payment date may vary depending on the payment processing company you use. Please be aware of this in advance.
■ Terms and Conditions
https://www.njpwworld.com/terms-and-conditions
・Article 8 (Fees and Payment)
・Article 9 (Automatic Renewal of the Monthly Pass)