本日10月21日（水）20:00より、全サービス（ブラウザ版・アプリ版・API連携など）を順次停止し、緊急メンテナンスを実施します。停止中はログインを含むすべての操作ができません。再開は10月22日（木）午前中の見込みです。 --- Starting today, Wednesday, October 21, at 20:00 (JST), all services (web browser version, mobile app version, external integration APIs, etc.) will be sequentially suspended for emergency maintenance. During the suspension, you will not be able to log in or perform any operations. Services are expected to resume during the morning of Thursday, October 22.