On Thursday, August 19, from 11AM to 3PM(JST), a system failure has occurred on our server resulting in frequent problems with login.
We confirmed that this system failure was not due to an external attack or computer virus.
The service has been restored and is now available as usual.

We sincerely apologize for any inconvenience caused to our customers.
We will do our best to prevent this kind of issue from happening again and provide better service.
Thank you for your understanding and cooperation.