Thank you very much for your continued support of back number.

We will be performing system maintenance on the following dates.

During this period, access to the site and app, as well as all services, will be unavailable.

[Maintenance date and time]

Monday, March 16, 2026 16:00-19:00

*Please note that maintenance times may vary depending on the situation.

[Services subject to maintenance]

・ back number official website & official fan club "one room"

・“Grateful Yesterdays Tour 2026” special website

・ back number official app

We apologize for any inconvenience this may cause to our customers, and we appreciate your understanding and cooperation.