"Tenchi Muyo! Mihoshi Special" is a two-episode OVA that serves as a spin-off to the broader "Tenchi Muyo!" franchise, focusing on the character Mihoshi Kuramitsu. The story centers on Mihoshi, a Galaxy Police officer known for her clumsiness and cheerful demeanor, as she embarks on a mission that quickly spirals into chaos. The narrative begins with Mihoshi being assigned to investigate a mysterious energy signal detected on a remote planet. Despite her reputation for causing unintentional trouble, she is determined to prove her competence.

Upon arriving on the planet, Mihoshi encounters a young boy named Kain, who is being pursued by a group of hostile aliens. Kain possesses a unique ability to manipulate energy, which makes him a target for those seeking to exploit his powers. Mihoshi, driven by her sense of duty and compassion, decides to protect Kain and help him uncover the truth about his abilities. As they evade their pursuers, the duo forms a bond, with Mihoshi acting as both a protector and a mentor to the boy.

The plot unfolds with a mix of action, humor, and light-hearted moments, characteristic of the "Tenchi Muyo!" series. Mihoshi's well-meaning but often misguided actions lead to a series of comedic mishaps, while the stakes gradually escalate as the true nature of Kain's powers is revealed. The story explores themes of responsibility, friendship, and self-discovery, as Mihoshi reflects on her role as a Galaxy Police officer and her ability to make a difference.

The main characters include Mihoshi Kuramitsu, whose optimistic and scatterbrained personality drives much of the narrative, and Kain, whose mysterious past and abilities add depth to the story. The antagonists, a group of alien mercenaries, provide a clear threat, though their motivations are tied to the larger mystery surrounding Kain. The OVA maintains a balance between its comedic elements and the underlying tension of the plot, offering a self-contained story that complements the broader "Tenchi Muyo!" universe.