A Masked Monster being chased for stealing a microfilm with EAGLE secrets hides on a houseboat to avoid Kaijo and Asuka's pursuit.

The 1923 Kanto earthquake sparks fears of a Korean uprising in Japan. Many anti-colonial and leftist activists are arrested, including Fumiko and her partner Yeol. Accused of a plot to assassinate the Crown Prince, they are sentenced to death, later reduced to life in prison.