Tokyo is served by the port of Yokohama, but isn't actually a cruise port. Together, the port of Yokohama is the embarkation point for twenty-five sailings annually from Celebrity, MSC, Norwegian and more to Asia.
Cruises scheduled from Tokyo during the the peak season of fall are much more expensive than the the low season of winter. On average Tokyo is fairly expensive compared to other ports. The graph below shows the monthly average cost per day for cruises from Tokyo (Cruises only depart from Tokyo between February and November).