Born in Nagoya, Japan in 1950. Graduated Meiji University in Economics. Debut in 1974 with Kamigari. Won Kadokawa Award in 1977 with Kamigami no Maisō, and Nihon SF Taisho Award in 1982 with Saigo no Teki. Has authored over 140 works covering a wide range including SF, adventure, general fiction, police/mystery, and fantasy.