👋 Hi, @takashi yoshihara! Welcome to the Box Community! As we can only provide assistance in English, I have translated the content to help better understand the issue.
If your account was originally set up using Google Sign-In, you can reset your password by visiting this link: https://app.box.com/reset. This will allow you to create or reset forgotten password and log in to Box using your username (the email you registered with) and password.
Please let us know if this resolves the issue with logging in. If not, we will escalate the matter to our Product Support team for further assistance.
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