Kōji Seki
Directing
Known For
Pinku from 1972.
Hentai kazoku

On a beach, Masao remembers the summer romance between him and Tatsuya. Part of the "Rose Tribe" trilogy that launched gay pink film in 1982.
Roses, the Sea and the Sun
Pinku from 1966.
Trap of a Love Potion

A gynecologist, his son and a friend have erotic adventures with a device that can see through clothes.
Sanjigen tōshi: Sex ultra eye
Pink film distributed by Shintoho.
Kezorima
Pinku from 1965.
Maizôkin monogatari: Zangyaku no ana
Tahei becomes an invisible man the moment he drinks a mysterious potion. In the first part of the film, it depicts daring sexual encounters and lesbian affairs involving women who proudly maintain respectable images—namely a female police officer and a nun. In the second part, Tahei, now working as a traveling salesman in rural areas, finds himself embroiled in a series of outrageous molestation escapades when he encounters two intriguingly nicknamed women: one called “A Thousand Earthworms” and another known as “Three-Tiered Drawstring Choke” (both epithets referring to their notably alluring attributes). Born from the outlandish idea of using invisibility to freely indulge in molestation and tryst, this work is an unconventional and idiosyncratic pornographic film designed to fulfill the secret desires of men.
Molester Invisible Man IV: Deepest Depths

A blackmarketeer and his mistress try to swindle people at a hot-spring resort, but are thwarted by the local inhabitants.
Special

A madman is on the loose, raping and murdering women and sometimes engaging in necrophilia. After one woman manages to flee the criminal before he has killed her, she goes to the police for help in bringing him to justice. The criminal targets the woman for murder.
Abnormal Criminal
Pink film directed by Kôji Seki.
Kôi ninshin/Chûzetsu
In a 1963 review of this film for the Naigai Times, Minoru Murai coined the term "Pink film" by suggesting a "Pink Ribbon prize" should be awarded to these softcore erotic productions, which were known as "Eroductions" in the 1960s.
Desire in Cavern
What if a secret potion could instantly turn you into an invisible man!? Rape a nun, peep into the women's bath, and even butt in on a lesbian encounter… It fulfills every man’s secret desire that everyone has dreamed of experiencing at least once! This is the third installment of a slapstick, farcical pornography comedy, depicting the wild adventures of a man who accidentally discovers a secret potion that makes him invisible. Taihei transforms again into the elusive invisible man, offering us an unvarnished look into a world of unabashed lust. First, an insidious lesbian encounter takes place between two nurses. When the invisible Taihei intrudes on the scene, he goes after both women… Next, he unleashes his mastery of molestation against a nun at a convent. Still unsatisfied, he invades the women’s bath at a public bathhouse, and a series of provocative, titillating scenes unfold as he exploits the effects of the invisibility potion.
Molester Invisible Man III: Indecency?

1965 Japanese movie
Tekka geisha
Pink film by Koji Seki.
Japanese Erotic Stories: Night Visits
Pink film by Kôji Seki.
Chikan tômei ningen me-me-me: Part 2
Pinku from 1972.
Sex Documentary Peek at Japan's Private Parts: Japan's First Infrared Movie
"Apartment Wife" pink film distributed by Okura Eiga.
Apartment Wife Sex Group
Pinku from 1970.
蛇淫の舘
Pink film by Koji Seki.
Perverted Couple
Pink film directed by Kôji Seki.