死んだ大西の財産を相続したロックは、大西邸跡地に遊園地を作る計画に着手していた。下田はそんなロックこそが一連の事件の犯人だと確信しているが証拠がない上に、動物に変身する人間の話などをするせいで警察内部で浮き上がってしまっていた。下田は単身工事現場に乗り込むのだがバンパイヤ族にみつかり、追い詰められてしまう。一方、離れ小島に囚われていたミカはトッペイの母親と会い、島から小船で脱出する。そんなふたりを原人が追いかけた。
After succeeding the legacy of the deceased Onishi, Rock plans to construct an amusement park on the vacant lot of his mansion. In the meantime, police inspector Geta stands out among his colleagues at the police station: he is the only one convinced that Rock is the criminal involved in the series of incidents but has no evidence, and he tells his colleagues about a man transforming into an animal. Geta smuggles himself onto the construction site alone, but is discovered by the Vampires and driven into a corner. Meanwhile Mika, who is imprisoned on a small island, meets Toppei's mother, and the two escape from the island on a small boat. But they are then followed by a primitive savage.
