directors Kan Mukai and Giichi Nishihara established their own production companies—Mukai Productions and Aoi Eiga. The "first queen of Japanese sex movies" was Noriko Tatsumi, who made films at World Eiga and Nihon Cinema with director Kōji Seki. Other major Sex Queens of the first wave of pink film included Setsuko Ogawa, Mari Iwai, Keiko Kayama, and Miki Hayashi. Other pink film stars of the era include Tamaki Katori, who appeared in many films for Giichi Nishihara and Kōji Wakamatsu; Kemi Ichiboshi, whose specialty was playing the role of a violated innocent; and Mari Nagisa. Younger starlets like Naomi Tani, and Kazuko Shirakawa were starting their careers and already making names for themselves in the pink film industry, but are best remembered today for their work with Nikkatsu during the 1970s. Toei Pinky Violence Until the late 1960s, the "pink film" market was almost entirely the domain of low-budget independent companies. At the beginning of the 1970s, now losing their audiences to television and imported American films, Japan's major film studios were struggling for survival. In 1972, Richie reported, "In Japan, the eroduction is the only type of picture that retains an assured patronage." To tap into this lucrative audience, major studio Toei entered the sexploitation market in 1971. In films like his ero-guro series and Joys of Torture series of the late 1960s director Teruo Ishii provided a model for Toei's sexploitation ventures by "establishing a queasy mix of comedy and torture." Producer Kanji Amao designed a group of series—shigeki rosen (Sensational Line), ijoseiai rosen (Abnormal Line), and harenchi rosen (Shameless Line), today collectively referred to as Toei's "Pinky Violence". Most of Toei's films in this style used eroticism in conjunction with violent and action-filled stories. Several of these films have the theme of strong women exacting violent revenge for past injustices. The series was launched with the Delinquent Girl Boss (Zubeko Bancho) films starring Reiko Oshida. Other series in the Pinky Violence genre included Norifumi Suzuki's Girl Boss (Sukeban) films, and the Terrifying Girls' High School films, both starring Reiko Ike and Miki Sugimoto. Other examples of Toei's films in this genre include Shunya Ito's Sasori (Scorpion) series of women in prison films based on Toru Shinohara's manga. Starting with Female Prisoner#701: Scorpion (1972), the Scorpion series starred Meiko Kaji, who had left Nikkatsu Studios to distance herself from their Roman Porno series. Toei also set the standard