Chikan Monogatari follows the escalating perversions of a degenerate protagonist who finds his ultimate pleasure in molesting unsuspecting women on packed commuter trains. Each episode introduces a new target for his depraved lust, from innocent schoolgirls in their sailor uniforms to busty office ladies. He starts with subtle, probing touches, his fingers expertly finding their way under skirts to grope their wet cunts and pinch their nipples through their blouses. The series graphically depicts his brazen assaults, showing his stiff cock pressing against their asses and his hands exploring every inch of their bodies. The women's initial shock and fear quickly turn into uncontrollable, shameful arousal, their bodies betraying them with dripping wetness and forced, shuddering orgasms as his relentless fingering and rubbing brings them to a climax they never asked for.