He was born in Otaru. His partner's name is Kenichi Yamamoto. The name of the comedy duo is 'Gokuraku Tombo'. They met at a theatrical school but they were poor so they quit together. After that they entered "Yoshimoto Kougyou" in 1984. Their popular act is 'KENKA NETA' and explosion. Koji plays the part of 'TUKKOMI'.