Travel to Japan and back question on cruise ships.?

I want to go to Japan and back in October. I want to take a ship, and I don't care if it is a Freighter. I am having a hard time finding a cruise ship that does this route. Can someone suggest something?

There are some very long cruises on ships that have a stop in Japan. This Princess cruise leaves from Vancouver, Canada and has a stop in Japan: http://www.princess.com/pb/itineraryDetails.do?voyageCode=M830A&tourCode=&dat e=&noOfPax=2&resType=C&definition_name=
before ending in China.

And here's another that leaves from Anchorage, Alaska and ends in China but has a stop in Japan: http://www.princess.com/pb/itineraryDetails.do?voyageCode=M831&tourCode=&date =&noOfPax=2&resType=C&definition_name=

If you want a freighter, here are some links to get you started.

http://www.freightercruises.com/

http://www.freightertrips.com/guide/ship...

http://www.gonomad.com/transports/0011/m...

gonomad.com