Born in Mie, Japan, in 1961. After working in instrumentation control, CAD programming, and video game design, he published his first work, The Blind Spot of Veis, based on the video game Creguian, in 1992. He gained popularity with his subsequent works, the Creguian series and the Rocket Girls series. In 2002, he published Usurper of the Sun, ushering in a new era of space science fiction in Japan. After first appearing as a series of short stories, Usurper won the Seiun Award for best Japanese science fiction novel of 2002. His other works include Pendulum of Pinieru and Fuwa-Fuwa no Izumi.