The film is a biography of anarchistSakae Ōsugi, who was assassinated by the Japanese military in 1923. The story tells of his relationship with three women: Hori Yasuko, his wife; Noe Itō, his third lover, who was to die with him; and his jealous, second lover, Masaoka Itsuko, a militant feminist who attempts to kill him in a tea house in 1916. Parallel to the telling of Ōsugi’s life, two students do research on the political theories and ideas of free love that he upheld. Some of the characters from the past and from the present meet and engage the themes of the movie.
Buehrer, Beverley (1990). "Eros Plus Massacre (1969) Erosu purasu gyakusatsu". Japanese Films: A Filmography and Commentary, 1921-1989. Jefferson, North Carolina, and London: McFarland. pp. 210–211. ISBN0-89950-458-2.
Desser, David (1988). "Three Men Who Left Their Will on Film". Eros Plus Massacre: An Introduction to the Japanese New Wave Cinema. Bloomington and Indianapolis: Indiana University Press. pp. 200–209. ISBN0-253-31961-7.