"Slayers Premium" is a 2001 OVA that serves as a continuation of the "Slayers" franchise, set in a fantasy world filled with magic, demons, and adventure. The story centers on Lina Inverse, a powerful and hot-tempered sorceress, and her companions: Gourry Gabriev, a skilled but somewhat dim-witted swordsman; Amelia Wil Tesla Seyruun, a justice-obsessed princess and martial artist; and Zelgadis Greywords, a chimera swordsman seeking a cure for his cursed form. The group finds themselves entangled in a new quest when they encounter a mysterious girl named Raltark, who claims to be a servant of the Sea Queen. Raltark seeks their help to retrieve a magical artifact known as the "Sea Queen's Orb," which has been stolen by a group of pirates led by the cunning and ruthless Captain Zangulus.

The narrative unfolds as Lina and her companions journey to the pirates' hideout, facing numerous obstacles and battles along the way. The orb, however, is revealed to be more than a simple treasure—it holds the power to control the Sea Queen, a legendary being capable of unleashing catastrophic destruction. As the group delves deeper into the mystery, they uncover a plot by Zangulus to use the orb to summon and control the Sea Queen for his own nefarious purposes. The stakes escalate as Lina and her friends must prevent the orb from falling into the wrong hands while contending with Zangulus's formidable crew and their own internal conflicts.

The OVA maintains the series' signature blend of action, humor, and fantasy, with Lina's explosive magical abilities and sharp wit taking center stage. The dynamic between the characters remains a key element, with Gourry's loyalty, Amelia's idealism, and Zelgadis's pragmatism providing both comedic and dramatic moments. The story culminates in a climactic battle where Lina and her allies confront Zangulus and his forces, ultimately thwarting his plans and ensuring the orb's safety. "Slayers Premium" delivers a self-contained adventure that captures the essence of the "Slayers" universe, offering fans a satisfying mix of familiar elements and new challenges.