Gemini is a 1999 horror film by Shinya Tsukamoto, loosely based on an Edogawa Ranpo story, which pursues his theme of the brutally physical and animalistic side of human beings rearing its ugly head underneath a civilized veneer, present in previous films like Tetsuo: The Iron Man (1989) and Tokyo Fist (1995), in what is a new territory for Tsukamoto—a story set in the late Meiji era (1868–1912) with no stop-motion photography and no industrial setting.

Shinya Tsukamoto is a Japanese filmmaker and actor. With a considerable cult following both domestically and abroad, Tsukamoto is best known for his body horror/cyberpunk film Tetsuo: The Iron Man (1989), which is considered the defining film of the Japanese Cyberpunk movement, as well as for its companion pieces Tetsuo II: Body Hammer (1992) and Tetsuo: The Bullet Man (2009).