Jero Seitashi inhabits Matoba, the world between the opposing White and Black Kingdoms. As a Talisman, he shares this middle realm with Genki. Driven by inventive genius, Jero constantly engages in technological creation, his practical and innovative nature contrasting sharply with Genki's reliance on luck.

His journey ignites upon encountering the amnesiac angel Jujika and a magical turtle bearing a hologram of the sage Super Zeus. This meeting reveals Jujika's quest to find the Seven Divine Messengers and reach the Super Divine Diana. Jero joins this mission, applying his inventive skills to overcome obstacles.

Their quest gains critical urgency following the invasion by the Black World's ruler, the Black Queen, who transforms ordinary inhabitants into hostile forces, threatening peace across the realms. Throughout the search for the Divine Messengers, Jero deploys his technical expertise to counter the Black Queen's influence and aid the group's objectives. He stands as a key participant in the struggle to protect Matoba and restore balance against the encroaching darkness from the Black Kingdom.