The best I can figure there is not a route of any ferry that goes Petropavlovsk → Kurils → Hokkaido.
It is possible to hop a ferry from Petropavlovsk → Vladivostok → Korsakov (Sakhalin) → Hokkaido using Sasco and Heartland Ferry but the schedule for both stop on September 30th.
According to another article Sasco provides ferry service to Kurils which is confirmed by Sakhalin Region Transport Ministry and it runs year round from Sakhalin. The ship stops at major Kuril islands and runs weekly in the summer and every second week Oct-Feb. There is an exact timetable on the website of the Ministry, see above, but it is in Russian. The Kamchatka’s corresponding ministry doesn’t provide any additional information on the subject.
You also could call up Petropavlovsk’s Port to find out if any of the ships actually go your route and can take you on board but I wouldn’t hold my breath.
Credit:stackoverflow.com‘
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