Thank you so much for always supporting back number.

This time, in order to improve our services, we will be upgrading our system to a new version.
We will be performing nighttime maintenance on the following dates.

During the maintenance period, all services, including website access, login, and ticket pre-sale applications, will be unavailable.

We apologize for any inconvenience this may cause, and we appreciate your understanding.

■ Maintenance period
Monday, September 28, 2026, 1:00 AM - 7:00 AM(Scheduled) (Japan time)
*The end time may vary depending on the progress of the work.

■Target Services

-back number official website

・back number official fanclub「one room」

back number official app