Okoge (おこげ, Fag Hag) is a gay-themed Japanese film written and directed by Takehiro Nakajima, released in 1992. A straight young woman living in Tokyo becomes involved in the lives of a gay man and his married lover.
https://ja.wikipedia.org/wiki/おこげ_(映画)
https://www.imdb.com/title/tt0107739/
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