Kōji Seki is a notable figure in Japanese cinema, particularly recognized for his contributions to the pink film genre during the late 1970s and early 1980s. His film "Perverted Couple" (1980) stands out as a quintessential example of the genre, blending provocative storytelling with bold visual style. This film not only garnered a cult following but also became a significant collectible among enthusiasts of erotic cinema, thanks to its unique narrative and Seki's distinct directorial approach. Collectors are particularly drawn to Seki’s work because of the limited availability of his films on physical media, especially in the West. "Perverted Couple" has been released in various formats, with early VHS editions being highly sought after for their retro aesthetic and cultural significance. As home video formats evolve, Seki's films remain a testament to the bold creativity of their time, making them essential additions to any serious collector's library.