He studied the English language at and graduated from Sophia University. In 1998, he won the silver in the fifth Dengeki Novel Prize with his debut novel, Called Gehenna. He went on to win the Japan SF Rookie of the Year Award in 1999 with M.G.H., and a special prize in the Sneaker Awards in 2000 with Earth Reverse. He is currently most well-known for the Asura Cryin' series. He also wrote Metal Gear Solid: Portable Ops for the PSP.