Onna Jimuin: Shikijo Seikatsu (1982)
A librarian who is the mistress of of a married dude sleeps with a pregnant young woman and her lowlife boyfriend separately, and then she tries to break them apart.
Actors: Masayoshi Takigawa
Nanpa (1988)
An office lady sleeps with a guy she met in a bar after she finds out that her fiancé and her co-worker had a past relationship.