Well, this season is more in your face. I actually love Hei's rave music and Mao's new music this episode.
They would prob have to alter it a bit to fit in imo. It's a nice piece of music.
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So if they are traveling north by ferry, would their next destination be
Sakhalin or
Kuril?
An alternate route could be Vladivostok ---> Vanino (
40 hours), Vanino ----> Sakhalin,
Korsakav, Sakhalin ----> Wakkanai, Hokkaido There's a trip guide for this route
here.