Two interwoven stories. The first is a biography of anarchist Sakae Osugi which follows his relationship with three women in the 1920s. The second centers around two 1960s' students researching Osugi's theories.
After hijacking a space shuttle, a spy finds that the controls are malfunctioning and sees alien battleships approaching Earth. Many years later, when the arc of his flight path returns to earth, he finds the planet under alien domination.