Izuki Kogyoku is a Japanese author born in 1984 in Kanazawa, Ishikawa Prefecture. She graduated from the literature department of Kanazawa University. She began writing novels in elementary school, inspired by the works published under the Cobalt Bunko imprint. During high school, she was a member of a literary club and won the Minister of Education Award in a national literature competition. She made her professional writing debut in 2006 when her novel Mimizuku to Yoru no Ou, known in English as Horned Owl and King of the Night, won the Grand Prize in the thirteenth Dengeki Novel Prize. This debut work established her as a light novelist with a taste for dark fantasy narratives.

Her literary bibliography includes a series of light novels often described as a man-eating trilogy, which includes MAMA and Snow Mantis, as well as Garden Lost, Spit Reviled of the Princess and the Star Stone, and Welcome to the Castle Hotel. Beyond light novels, Kogyoku has contributed to video game scenarios. She wrote a short story for the game Fragile Dreams: Farewell Ruins of the Moon and worked on Final Fantasy: The 4 Heroes of Light.

In the anime industry, Izuki Kogyoku is recognized as one of the original creators behind the 2015 anime series Chaos Dragon. The project was based on a tabletop role-playing game titled Red Dragon, which was played by five notable writers over six days. Alongside Gen Urobuchi, Kinoko Nasu, Ryōgo Narita, and Simadoriru, Kogyoku helped create the characters and world that would be adapted into a twelve-episode anime produced by Silver Link and Connect. For the Chaos Dragon anime, she is specifically credited with creating the character Eiha, a guardian fused with a demon who protects the protagonist. This involvement highlights her role within a collaborative team of prominent fantasy authors, contributing to a media franchise that also included a board game and a mobile role-playing game.

Her artistic identity is rooted in fantasy literature featuring resilient protagonists who confront adversity, often within atmospheric and dark settings. Her prose frequently blends gothic aesthetics with emotional depth, a style that has been praised for its imaginative world-building. Her significance in the industry stems from her longevity as a published novelist since the mid-2000s, her successful transition from award-winning light novel author to anime and video game scenario writer, and her collaboration with some of the most prominent names in Japanese fantasy writing on a major multimedia project like Chaos Dragon.