Historical chart showing the number of Orca hunted off the coasts of Hokkaido 1948-1972.
A majority of the hunt was done by Honshu (mainland Japan) whalers and was done primarily for the purpose of oil. Hunts took place in waters surrounding Hokkaido including the Sea of Okhotsk near the coast of Abashiri and in the Nemuro Straight.
1964-1967 the hunt numbers spiked, but since have plummeted. 1973 and on, the Orca hunts have been nearly non existent.
Looks like the Japanese Transients have a taste for beaked whales!
06.06.2015 a group of Transients was seen off the coast of Rausu feeding on a beaked whale carcass. Most of the action seemed to take place underwater, but these two images were able to be captured at the surface.
TV Asahi reported that small group of 3-4 Orca was seen in the Tokyo Bay around 10AM of May 25, 2015. Sightings of Killer Whales inside the bay are extremely rare. The group was sighted in the bay again on the morning of the 26th; the reason behind their presence is not clear. A warning for ships to use caution and avoid interfering with the whales in Tokyo Bay was issued.
In Japan, Orca are more commonly seen off the north eastern coasts of Hokkaido. For comparison, this map (via Google Maps) shows the Shiretoko Peninsula of Hokkaido marked by a star, the Tokyo Bay marked with a red pin: