New Apartment Wife: Blue Film Woman (1975)

Yukichi Asano and Kiriko, his wife, love each other very deeply and are completely happy in their cozy, little flat. Then Yukichi discovers that Kiriko had once worked in a blue film, a thing unthinkable to a man like Yukichi and his love turns into burning hate and jealousy. He burns the film and tries to forgive his wife's unfortunate past but Kiriko suffers a thousand deaths for she had actually worked in four more blue films.