Tokyo is not itself a cruise port, but is served by the port of Yokohama. In total, the cruise port of Yokohama serves as the port of embarkation for twenty sailings yearly from Norwegian, Holland America, and Celebrity to Asia.
On average cruises from Tokyo are moderately expensive compared to other ports. Look at the chart below for the monthly average cost per day (Cruises only depart from Tokyo between February and November). Sailings scheduled from Tokyo during the the peak season of spring are much more expensive than the low seasons of winter and fall.