"Dirty Pair: Flight 005 Conspiracy" is a 1990 anime OVA that serves as a continuation of the "Dirty Pair" franchise, focusing on the adventures of Kei and Yuri, two highly skilled but disaster-prone Trouble Consultants working for the World Welfare Works Association (3WA). The story is set in a futuristic universe where the duo is tasked with solving complex cases, often involving corporate espionage, political intrigue, and criminal conspiracies.

The narrative begins with Kei and Yuri boarding Flight 005, a luxury space liner, on a mission to escort a valuable cargo of rare medicinal plants. The plants are intended to aid in the development of a cure for a deadly virus plaguing a distant colony. However, the mission quickly takes a dangerous turn when the flight is hijacked by a group of terrorists led by a mysterious figure known as Colonel Kott. The terrorists demand the cargo, revealing that the plants hold a secret far more valuable than their medicinal properties.

As the situation escalates, Kei and Yuri discover that the hijacking is part of a larger conspiracy involving a powerful pharmaceutical corporation. The corporation has been manipulating the virus outbreak to monopolize the cure and profit from the crisis. The duo must navigate a web of deceit, betrayal, and sabotage to uncover the truth and prevent the terrorists from using the plants for their own nefarious purposes.

Throughout the OVA, Kei and Yuri’s dynamic partnership is central to the story. Kei is portrayed as bold, impulsive, and quick to action, often relying on her combat skills to resolve conflicts. Yuri, on the other hand, is more analytical and level-headed, using her intelligence and technical expertise to outmaneuver their enemies. Their contrasting personalities and teamwork drive the narrative forward as they face off against both the terrorists and the shadowy forces behind the conspiracy.

The plot is fast-paced, blending action, suspense, and moments of humor, characteristic of the "Dirty Pair" series. The OVA also explores themes of corporate greed, ethical dilemmas, and the consequences of unchecked power, adding depth to the otherwise action-driven storyline. By the end, Kei and Yuri manage to thwart the conspiracy, save the cargo, and expose the corporation’s crimes, though not without leaving a trail of chaos in their wake. The OVA concludes with the duo reflecting on their mission, ready for their next assignment.