He started game designing during his hospital admission probably in early 1990's. The brand-name "Kossetsu" means "bone breaking" and this is come from his hospital admission.
bone5 is his designer's name sometime used.
During early 1990's, Nifty-serve's Game Forum was sanctuary for deep game players. And his game became famous around gamers in Japan via Game Forum.
He is one of the most talented and most popular Euro-game style amateur game designer in Japan.
His work contains many games. For Example:
Do your Nuts