For the moment there is no residential Database
or Phone Number Listing available in Japan.
No Residential Listing
NTT, Nippon Telephone and Telegraph,
the historic Phone Company of Japan
does not have any Residential Listings
They only publish a Business Directory
Directory Assistance over the Phone by NTT
NTT communicates phonenumbers via Directory Assistance
which can only be called from inside Japan
search with a People Search Service
Japan People Search via Japan PI.com
Japan Gov Search
this search engine goes through
all the Japanese Gov Sites and the Japanese ministeries,
The person you are looking for
might be mentioned somewhere.
Business Directories for Japan
including NTT Directories
search in another country
Phone Book of the World.com
Annuaire du Monde.com
good luck ...