Born in 1971, she began her career writing novelizations, but the hit mystery series Gosick brought her work with several light novel publishers, and her book A Lollypop or a Bullet placed third in the Kono Light Novel ga Sugoi 2006 rankings. The book proved so popular it was republished by Fujimi Shobo as a mainstream novel. In recent years, she has published several novels through other mainstream publishers as well, making her one of the few light novelists to make that leap. In 2007, her novel Akakuchiba-Ke no Densetsu was nominated for the Naoki Prize. In 2008, she was nominated for a second time, for Watashi no Otoko, and won.