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Kiyoshi Nagai (永井潔, Nagai Kiyoshi) better known by the pen name Go Nagai (永井 豪, Nagai Gō), is a Japanese manga artist and a prolific author of science fiction, fantasy, horror and erotica. He made his professional debut in 1967 with Meakashi Polikichi, but is best known for creating popular 1970s manga and anime series such as Cutie Honey, Devilman and Mazinger Z.