Tokyo isn't a cruise port, but is served by the port of Yokohama. Added up, Yokohama serves as the point of embarkation for about fifty-five cruises every year from Celebrity, Royal Caribbean, Costa and more to Asia, along with other places.
Cruises departing from Tokyo during the peak months of spring, summer, and fall are much more expensive than the the low season of winter. Overall cruises from Tokyo are moderately expensive compared to other ports. The chart below shows the monthly average cost per day for cruises from Tokyo (cruises only depart from Tokyo between January and December).