"Armored Trooper Votoms: The Heretic Saint" is a four-episode OVA series set in the "Armored Trooper Votoms" universe, serving as a sequel to the original 1983 series. The story takes place on the planet Sunsa, where a religious cult known as the Sunsa Church has gained significant influence. The cult venerates a mysterious figure called the Heretic Saint, whose origins are tied to the legendary mercenary Chirico Cuvie. Chirico, a former soldier and skilled Armored Trooper pilot, becomes embroiled in the conflict surrounding the cult and its enigmatic leader.

The narrative begins with Chirico arriving on Sunsa, where he encounters a young woman named Fyana, who bears a striking resemblance to a figure from his past. Fyana is central to the Sunsa Church's beliefs, as she is believed to be the reincarnation of the Heretic Saint. The cult's leader, Bishop Shutain, exploits this belief to consolidate power and manipulate the populace. Chirico, driven by his own motives and a sense of duty, becomes determined to uncover the truth behind the cult and protect Fyana from those who seek to use her for their own ends.

As the story unfolds, Chirico faces off against various factions, including the Sunsa Church's militant forces and rival mercenaries. The conflict escalates as the true nature of the Heretic Saint is revealed, intertwining Chirico's past with the present-day events on Sunsa. The series explores themes of faith, manipulation, and the consequences of war, while maintaining a focus on Chirico's relentless pursuit of truth and justice.

The OVA retains the gritty, militaristic tone of the original series, with intense mecha battles and a morally complex narrative. Chirico Cuvie remains a stoic and determined protagonist, whose actions drive the plot forward. Fyana serves as both a catalyst for the story and a symbol of the cult's influence, while Bishop Shutain embodies the dangers of unchecked religious authority. The series concludes with a resolution that ties together the central mysteries while leaving room for further exploration of the "Votoms" universe.