Yutaka Aida(相田 裕Aida Yutaka), name shortened to Yu Aida in the publications of Gunslinger Girl, is a Japanese manga author and illustrator, born on November 8, 1977. He/She currently resides in Japan. Aida has done character designs for the hentai visual novel, Bittersweet Fools. His gender is somewhat speculated, but it can be assumed that he is male because Yutaka is a male Japanese name.