Akio was Black Satan's owner, who died of an unknown illness. He was from a poor family.

Shiroi Senshi Yamato

Black Satan had been very loyal to his master and Akio dug up the body from the grave and took it with Komaga-top. Black Satan guard the body for two years, until it died of self-oteltuaan Yamato and Jumbo jets against. Black Satan died next to his late master. After this, the villagers found the body and buried it again.