Hi ​@Taichi, 

Welcome to Box Community and we’re glad to help! 

As of this message, we're only able to offer full email and phone support in English.

We apologize for this limitation -- please contact us in this language, if you are able to post your question in English, the community would be able to assist. Google Translate or other tools may help! 

Thanks for posting, and we look forward to your reply!