Devil-Manta was the second and last unmade film concept Toei created before making Message from Space.
The first draft was done by Shotaro Ishimori and written by Susumu Takaku and Hajime Sato. Planning of the project was done by Toru Hirayama and Yajima Nobuo, and was to be directed by Hajime Sato and have special effects done by Nobuo Yajima.
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