The medical student Hirosuke Hitomi (Teruo Yoshida) is mysteriously interned in a mental institution without any explanation. When a stranger tries to kill him in his cell, he flees from the asylum and sees the young woman from the circus Hideko (Teruko Yumi) singing a lullaby that stays in his memory. She tells to him that she is from a coastal town, but out of the blue, Hideko is murdered. Hirosuke travels to the coast and learns in the newspaper that the wealthy Genzaburô Komoda, who is his doppelganger, has just died. He decides to assume his identity as if he had had only a sudden illness and revived. He lures his wife Chiyoko Komoda (Michiko Kobata), his mistress, the butler and the servants. When mysterious letters are delivered to his wife, who dies, and his mistress, he decides to travel to the island where Genzaburô's father Jôgorô Komoda (Tatsumi Hijikata) lives to find his origins. Soon he meets Jôgorô, who is a mad man that built an island of freaks, turning normal persons into malformed persons. Further, Hirosuke learns who he is.
"Kyôfu kikei ningen: Edogawa Rampo zenshû", a.k.a. "Horrors of Malformed Men", is a film certainly based on "The Island of Dr. Moreau" by the English author H. G. Wells (1866-1946). Japanese author Edogawa Rampo rewrote this tale and Teruo Ishii made this sick and transgressor film. The plot shows perversions, incest, the most freak creatures and a dreadful revenge, but is laughable many times. My vote is seven.
Title (Brazil): "O Horror dos Homens Deformados" ("The Horror of the Malformed Men")