Transferring Savings from U.S. to Japan

I’m retired, currently just moved here on a dependent visa in Japan and have savings in a U.S. bank account. I’m trying to understand the correct way to transfer money to Japan while staying fully compliant with tax rules.

Are there any tax implications I should be aware of when moving funds from the U.S. to Japan? does simply transferring my own savings trigger any taxes, or are there specific situations where it might?

Also, is there anything I should be doing differently from a tax or reporting perspective compared to just keeping the money in the U.S.?

I’m still learning how this works, so even basic explanations would be very helpful.

Thank you in advance.