Disclaimer: Since this thread was posted in the English section, I will respond in English accordingly.
Hi 辻田勝彦,
Thank you for reaching out to Microsoft Q&A Forum.
I understand the situation regarding your Microsoft account being inadvertently created using your company email address and subsequently linked to a home organization without an administrator.
In such cases, I recommend contacting Microsoft Support directly, as they are best equipped to assist with account-related issues, including removing or reassigning accounts from an unmanaged organization. You can explain the situation and request that your account be disassociated from the home organization.
To expedite the process, please have the following information ready:
The email address associated with the Microsoft account
A brief description of the issue
Any error messages or restrictions you're encountering
You can reach Microsoft Support here: https://support.microsoft.com/en-us/contactus
If things still don’t work out, feel free to share an update, I’ll be happy to assist further.