Itsuki Nanao is not an extensively recognized author outside of Japan, and as of my last update, there might be limited information available in English about this author. In Japan, Itsuki Nanao is a novelist and writer best known for the light novel series "Kakuriyo no Yadomeshi" or "Kakuriyo: Bed and Breakfast for Spirits," which has been adapted into an anime. The series blends elements of Japanese folklore and the supernatural with romance and culinary themes. It tells the story of a young woman who ends up in the spirit world and must use her cooking skills to survive and pay off her grandfather's debt to a demon innkeeper. Due to the limited information available, if you're looking for more detailed or updated information about Itsuki Nanao, you might need to consult the latest sources or databases that specialize in Japanese literature and media.