"UFO Princess Valkyrie: SPECIAL" is a 12-episode OVA series that serves as a continuation of the original "UFO Princess Valkyrie" anime. The story picks up after the events of the first season, focusing on the life of Kazuto Tokino, a young man who runs a bathhouse with his grandfather. Kazuto's life takes a dramatic turn when he encounters Valkyrie, a princess from the planet Valhalla who crash-lands on Earth. Valkyrie is on a mission to find her missing brother, Hydra, and restore peace to her war-torn home planet.

Valkyrie's arrival introduces a host of new characters and challenges. She is accompanied by her loyal attendants, including the stoic knight Sanada and the mischievous maid Akina. As Valkyrie and her companions settle into life on Earth, they form bonds with Kazuto and his friends, blending their extraterrestrial struggles with the everyday challenges of running the bathhouse. The narrative explores themes of family, loyalty, and the clash between duty and personal desires.

The plot thickens as Valkyrie's enemies from Valhalla, including the sinister Hydra, pursue her to Earth. These adversaries seek to exploit Valkyrie's powers for their own gain, leading to a series of confrontations that test the resolve of both Valkyrie and Kazuto. The series balances action-packed sequences with moments of humor and heartfelt emotion, creating a dynamic narrative that keeps viewers engaged.

Character development is a key element of the series. Valkyrie evolves from a sheltered princess into a determined leader, while Kazuto grows from a carefree youth into a responsible protector. Their relationship deepens as they face numerous trials together, highlighting the importance of trust and cooperation. Supporting characters, such as Sanada and Akina, also undergo significant growth, adding depth to the story.

The OVA format allows for a more focused and streamlined narrative compared to the original series, with each episode contributing to the overarching plot. The series concludes with a resolution that ties up major storylines while leaving room for future developments. "UFO Princess Valkyrie: SPECIAL" successfully builds on the foundation laid by its predecessor, offering a compelling mix of action, romance, and character-driven drama.