One Buller's Shearwater was recorded out at sea off the Shiretoko Peninsula, [northwest of Cape Shiretoko], on September 5, 2008, an event that was published in issue #31 (2010) of the Bulletin of the Shiretoko Museum (Kenkyuu Houkoku). According to this report, this was the first confirmed sighting of Buller's Shearwater in the Okhotsk region. [Status in the Sea of Okhotsk is given as Accidental Visitor in the OSJ Checklist, 2024, and the genus has changed here and at IOC and BOW from Puffinus to Ardenna.]
Elsewhere in Hokkaido, two photos of Buller's Shearwater in Nihon no Yachou 590 [Wild Birds of Japan 590] (2000) were taken off the coast of Kushiro, southeastern Hokkaido, in October (year not given).
Buller's Shearwater breeds on islands off the north island of New Zealand with sightings in Japan occurring mainly off the east coast of Honshu (south of Hokkaido) in August through October.