Can I register a .jp domain at 101domain without a Japanese contact address?
The short answer
101domain offers a paid Trustee/Proxy service that supplies the local contact information required for .jp. You still need to meet the other registration requirements, and the trustee service cannot move with the domain to another registrar.
In more detail
A .jp registration requires a Japanese contact address and phone number. If you cannot provide them yourself, 101domain’s Trustee/Proxy service is an option. Include its continuing fee in the domain budget, and establish what information you must supply and which contact role the trustee will take. Paying for this service does not guarantee approval of the application.
The main tradeoff is what happens if you later switch registrars. 101domain says its .jp trustee service is not transferable: an ownership update that meets .jp requirements must be completed before a transfer-out can begin. Work out how you would replace the local contact before relying on the service for a long-term business domain.