Saichi Sugimoto and his group arrive in Karafuto to search for Asirpa and Kiroranke. They meet a Karafuto Ainu girl and with her help reach a Russian village, where Kiroranke's group has been seen lately. By chance, another tattooed prisoner is found in the same village...

Kiroranke, Asirpa, Hyakunosuke Ogata, and Yoshitake Shiraishi make contact with Orok people in order to cross the Russian border. Yet they don't know that there's someone already waiting for them at the border...