Tokyo isn't actually a cruise port, but is served by the port of Yokohama. In total, the cruise port of Yokohama is the embarkation for twenty-five sailings yearly from Celebrity, MSC, Norwegian and more to Asia.
Sailings scheduled from Tokyo during the peak months of winter and spring are significantly more expensive than the the low season of fall. Overall Tokyo is rather expensive compared to other ports. Check the illustration below for the monthly average cost per day (Cruises only depart from Tokyo between February and November).