A boy, Tsuwabaki Daiya found a black fire in an ocean when he and his father were in a small boat. A big monster came out of the fire, and the father and the crews were disappeared into the sea. When he was about to become the next victim, a large mecka dragon appeared and saved him. 
5 years later since then, Daiya becomes a junior high school student. A big monster reappear, and he meets the mecha dragon,"Daiku Maryu". The head of the dragon separates from the body, and it turns into the body of a super robot, Gaiking. He gets in Gaiking, fights against the monster, and beats it. 
He learns that there is an enemy that plots to conquer the world, and he leaves for another world, Darius, to stop the plot. 
(Source: AnimeNfo)

__Agency:__ Aoni Production (current), 81 Produce (former), Tokyo Actor's Consumer's Cooperative Society (former) 

He took over the ongoing roles of Shigezō Sasaoka and Eiji Kanie after their deaths. In addition, he took over for Shinji Nakae as the narrator of variety show Hey! Spring of Trivia on May 12, 2007.

Daimon