was a Japanese science fiction, fantasy, and horror author. His name is alternatively transliterated as Ryà  Hammura. While he wrote books as Ryà  Hanmura his real name was .
He won the first Izumi Kyà Âka Prize for Literature for his novel in 1973. He won the Naoki Prize for his 1975 novel . He won also the 1988 Nihon SF Taisho Award.
One of his novels was the basis of the 1979 film . A series of role-playing video games called is loosely based on his novel by the same name.
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