Notice Regarding a Suspicious Authentication Prompt

We have confirmed that a suspicious authentication prompt may have appeared on certain pages of our website through an external service (polyfill.io). The issue has been resolved, and the affected component was removed on June 17, 2026, at 1:00 p.m. (JST)
Our website does not require users to register or log in. However, if you entered a username or password into the prompt, we recommend that you change the password for any other services where you use the same credentials. At this time, we have found no evidence of unauthorized access to this website.

We sincerely apologize for any concern or inconvenience this may have caused.