Born in 1956 in Sapporo, Hokkaido. Graduated Toyo University to work at Kokusho Kankôkai, famous in Japan as the publisher of Lovecraft and many other works of horror and fantasy. Debut work as an author was Makyo no Gen'ei (Echoes of Ancient Cults), in 1986. He continues to be active in a wide range of activities, including writing extensively in the weird historical and horror genres. While remaining extremely interested in the Cthulhu Mythos, lately he has been concentrating on weird historicals set in the Muromachi period (1333-1573).