Chairman of big enterprise "Serizawa Japan". Kamonojo keeps fighting against Kanryuusai who is the grandfather of Isami for years as a good rival. He has cherished Isami like a true grandchild.

Spoiler

Kamonojo is KuroTengu who is the chairman of the Kurotengu tou that plots the world domination. He was a space alien who made an emergency landing to the earth 200 years ago, and they originally had Ruminotait. Because he wanted to return to the planet in the hometown, and wanted the financial power and the person for a newly built spaceship, he was planning the world domination. He repeated rejuvenation by the power of Ruminotait.