Japanese invoicing has a few requirements that do not exist elsewhere, and they are usually discovered when a client sends something back. These guides cover the ones that come up most often, in English, with links to the tax authority's own material.
Why Japanese clients ask for a T-number, whether you should register, and the six items a compliant invoice has to show.
Why 10.21% is missing from your payment, which work is covered, how the rate changes above one million yen, and how to get it back.
Closing dates and payment cycles, how to address the document, the bank fields a Japanese transfer needs, and who pays the transfer fee.
These guides are general information about Japanese practice, not professional advice. For a decision that turns on your own circumstances, consult a licensed tax accountant or the tax office.