Born in 1953 in Tokyo Prefecture, NISHIKUBO joined the Waseda University Broadcasting Society in 1972, and joined Tatsunoko Production Company in 1976. After leaving the company in 1979 he worked under the guidance of DEZAKI Osamu. He then became a freelance director for TV and original video animations, films, commercials, promotional videos, and games. He worked as a director for the films Atagoal: Cat's Magical Forest, Musashi: The Dream of the Last Samurai, and Giovanni's Island; the original video animations Radio City Fantasy and Video Girl Ai; the animated TV series Miyuki, Red Photon Zillion, Legend of the Heavenly Sphere Shurato, and Otogi zoshi; the commercials Where Dreams Come True and NEXT A-Class; and the Yarudora game series. He has also worked as a sequence director in a series of works directed by OSHII Mamoru, such as Ghost in the Shell 2: Innocence. Giovanni's Island has won 15 awards in eight countries, including at the Annecy International Animated Film Festival (France), the Fantasia International Film Festival (Canada), the Mainichi Film Awards (Japan), and the Chicago International Children's Film Festival (United States).