In'yoku Tokkyuu Zetsurin Ou Episode 1 introduces viewers to a world where the enigmatic Oraga Stone serves as the pivotal energy source for activating cyborgs. This unique power is harnessed through the sexual stimulation of women, leading them to climax. The narrative unfolds with the M-77 Express, a formidable train, being commandeered by a rogue professor who has forsaken his virtuous path to pursue malevolent ambitions. In response, the protagonists deploy the Sex Desire Express Zetsurinou, embarking on a mission to thwart the professor's nefarious plans.
The episode seamlessly blends elements of science fiction and eroticism, presenting a storyline that is both provocative and action-packed. The animation vividly portrays the fusion of human desires with mechanical prowess, creating a distinctive aesthetic that captivates the audience. Thematically, the episode delves into the dichotomy of good versus evil, exploring how primal urges can be manipulated for both righteous and sinister purposes.