Kōji Seki

aka (born September 20, 1911, date of death unknown) was a Japanese film director, known for his pioneering work in the pink film genre. Among the accomplishments of Seki's career: he directed the first pink films for Kokuei, the oldest pink film company, Japan's first 3-D film, the world's first 3-D sex film, and Japan's first "invisible man" pink film. His father was in the construction business. After graduating from high school in 1930, Seki attended the Tokyo School of Fine Arts (merged into Tokyo University of the Arts in 1949), dropping out after one year. Seki's films of this time bore such titles as , and . Through Valley of Lust, Seki was indirectly responsible for the name pinku eiga applied to Japanese theatrical softcore films. The films were called during most of the 1960s. In a review of Valley of Lust in the sports paper Naigai Times, writer Minoru Murai suggested that the genre should have a "Pink Ribbon Award" as an equivalent of the mainstream "Blue Ribbon" award given to films by the paper. The color pink was meant to suggest the blushing that the films induced in viewers. Seki filmed a sequel the year of the first film's release,.

In 1964, Seki directed writer Oniroku Dan's sister, Miyoko Kuroiwa, in the pink film . Kuroizawa was best known as a jazz singer. Seki gave future S&M Queen Naomi Tani her film debut with (1967). He also became associated with Noriko Tatsumi, who is considered the first Queen of Japanese sex films. He directed Tatsumi in some of her best-known films, including Whore (1967) and Erotic Culture Shock: Swapping Partners (1969). Seki's 1967 film was Japan's first 3-D film, Seki remade the film as Abnormal Sex Crimes (Ijō sei hanzai, 1969). Seki's 1968 film, was the first pink film with an "invisible man" theme. The film inspired three sequels.

Partial filmography