Six months later, the snow on the mountains have thawed enough for a proper search to be mounted, Takashi and Machiko return to the Japanese Alps with anthropologist Professor Shigeki Koizumi (Nobuo Nakamura) as leader of the expedition. There is little hope of Kiyoshi having survived, a fact which Machiko seems to have come to terms with; but if there is some clue what happened to him and the others, Takashi is determined to find it. Determining Kiyoshi's fate, though, is almost incidental to Koizumi's intentions: the main focus of the expedition is to find out if there is a previously unknown bipedal primate lurking in the area.