Pink film refers in Japan to movies produced by independent studios that includes nudity or deals with sexual content. This encompasses everything from dramas to action thrillers and exploitation film features. Many pink films would be analogous to erotic thrillers, e.g. Fatal Attraction, Fifty Shades of Grey, Basic Instinct, 9½ Weeks.

Daydream is a 1964 Japanese pink film. It was the first erotic film to have a big budget and a mainstream release in Japan, and 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.