http://jprs.co.jp/en/
JPRS in English. Below is info on ownership.
Q1
Can a non-Japanese corporation register a JP domain name?
A1
Companies or individuals that have a permanent postal address in Japan are eligible for registration of 2nd level, i.e., General-use JP Domain Name.
3rd level name under CO.JP may be applied by the companies incorporated with official registration in Japan. Non-Japanese corporations registered in Japan as "Gaikoku Kaisha (Foreign Company)" may also apply for a CO.JP domain name.
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Q2
How can our company register a CO.JP domain name?
A2
Registrant of a CO.JP name must be a corporation registered under the laws of Japan. Non-Japanese corporations registered in Japan as "Gaikoku Kaisha (Foreign Company)" may also apply for a CO.JP domain name.
CO.JP domain name may be registered through JP Registrar. Please consult with them for details. The list of the Registrars is found at:
http://jpshop.jp/list/ojp_list/
(For Organizational and Geographic Type JP Domain Name. Written in Japanese)
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Q3
How can I register a 2nd-level, General-use JP Domain Name?
A3
Any individual, group or organization having a permanent postal address in Japan is eligible for registration of General-use JP Domain Name.
Please consult a JP Registrar for details. You can find out your JP Registrar from the list at the following URL:
http://jpshop.jp/list/gjp_list/
(Written in Japanese)
Q4
What is the required registration process and how much is the cost?
A4
Your registration will be completed through JP Registrar. And the fee for the registration varies according to the types of services offered by the Registrar. Please refer to the list of the JP Registrars for further details.
http://jpshop.jp/list/ojp_list/
(For Organizational and Geographic Type JP Domain Name. Written in Japanese)
http://jpshop.jp/list/gjp_list/
(For General-use JP Domain Name. Written in Japanese)