Movie: Extreme Private Eros: Love Song 1974 (1974)
Plot: A man, Kazuo Hara, himself make a documentary incredible about your ex-wife! He explore the exploration adventures of Miyuki Takeda with her new homosexual relation with Sachiko Kobayashi, and interracial relations. Kazuo Hara make a very sensitive film, showing with one honest the dramas and fear of one society confronted with the profound transformations.
Original Title: Gokushiteki erosu: Renka 1974 (1974)
Director: Kazuo Hara
Cast: Kazuo Hara, Miyuki Takeda and Sachiko Kobayashi.
IMDB site of the movie :