Daydream (1964)
Daydream is a 1964 Japanese Pink film. The first of these softcore pornographic films to have a big budget and a mainstream release in Japan, it was shown at the Venice Film Festival and given two releases in the United States. Director Tetsuji Takechi remade the film in hardcore versions in 1981 and 1987. Both of these remakes starred actress Kyōko Aizome.
More at Wikipedia.