Sukeban Deka II in 1985-1986 starred Yoko Minamino as the second "Sukeban Deka", a mysterious girl with an iron mask named Yoko Godai who takes on the identity of Asamiya Saki after being freed from her mask; She will get the help of two other sukeban: Kyoko "Okyo" Nakamura (Haruko Sagara), and Yukino Yajima (Akie Yoshizawa, from jpop band Onyanko Club which will appear in two episodes).

Jiban goes into action to save Yoko and several captured children from Doctor Giba's plot of creating the ultimate lifeform.

Masaru Aso was the lab assistant of geneticist Doctor Mochizuki, used as one of his experiments related the creation of the Neo Organism, enabling him to transform into a grasshopper-like being called Kamen Rider ZO. He fled into the mountainside and went into a coma before he was awakened by a telepathic call two years later with an unconscious urge to protect Hiroshi Mochizuki, the son of Doctor Mochizuki.