Natsumi Itsuki (樹なつみ, Itsuki Natsumi?, born 1960-02-05 in Kobe, Hyogo, Japan) is a Japanese shōjo manga artist best known for writing science fiction manga. She debuted in 1979 with Megumi-chan ni Sasageru Comedy in LaLa. She won the 1993 Seiun Award for best science fiction manga for Oz and the 1997 Kodansha Manga Award for shōjo manga for Eight Clouds Rising. Several of her works have been adapted as anime, including Jyu Oh Sei, Oz, and Eight Clouds Rising. Her series Demon Sacred and Jyu Oh Sei are licensed in North America by Tokyopop, and the anime of Jyu Oh Sei is distributed in English by Funimation.

Source: Wikipedia