"Cyborg 009 Vs. Devilman" is a crossover anime OVA that brings together the iconic characters from Shotaro Ishinomori's "Cyborg 009" and Go Nagai's "Devilman." The narrative unfolds as the Cyborg 009 team, a group of nine individuals transformed into cyborgs to fight against global threats, encounters Akira Fudo, the human host of the demon Amon, known as Devilman. The story begins with the Cyborg 009 team investigating a series of mysterious incidents involving demonic activity. Their mission leads them to confront Devilman, who initially appears as a threat due to his demonic nature.

As the plot progresses, it becomes clear that both groups are being manipulated by a greater evil. The Black Ghost organization, a recurring antagonist in "Cyborg 009," is revealed to be orchestrating the conflict by summoning demons to wreak havoc. The Cyborg 009 team and Devilman must overcome their initial mistrust and join forces to combat this shared enemy. The narrative explores themes of unity, sacrifice, and the struggle between humanity and monstrous forces.

The main characters include Joe Shimamura (Cyborg 009), the leader of the cyborg team, and Akira Fudo (Devilman), whose internal conflict between his human emotions and demonic powers adds depth to the story. The supporting cast features other members of the Cyborg 009 team, each with unique abilities, and Miki Makimura, a close friend of Akira who represents his human side. The OVA blends action, drama, and supernatural elements, culminating in a climactic battle against the demonic forces unleashed by Black Ghost. The resolution emphasizes the importance of cooperation and the enduring fight for justice, leaving a lasting impact on both franchises.