Here are a couple of schools, but you need somebody who speaks Japanese. I personally don't think you will be able to succeed flying in Japan, but you might be able to find somebody flying you and your folks around:
Code:
http://www.alpha-aviation.net/
http://www.sky-high.co.jp/
http://www.sgc-air.co.jp/
-- // --
You could also try to find Mr. Satoshi Kondo of the Museum of Aeronautical Science in Narita. He's FAA trained PPL(A) and flies in Japan. He's the manager or director of the museum or something along those lines. A very nice person.
Beware of prices, he told me it's almost $800 for an hour in an old Cessna, I kid you not. I am not sure if you will be able to fly as a foreigner though, the people I met are all Japanese (that came to the USA for training). I saw a lot of helicopter activity over Tokyo on my few visits, apparently a lot of filming going on but I have no details.
-- // --
You could also try to call JJ Aviation at Torrance Airport (KTOA) in Los Angeles. It's a helicopter flight school but the owners are a Japanese couple and I am sure they might have a contact in Japan.
Let us know if you have any luck.