"Slayers Excellent" is a two-episode OVA series that serves as a prequel to the main "Slayers" storyline, offering insight into the early adventures of the sorceress Lina Inverse and her companion, the swordsman Gourry Gabriev. The narrative begins with Lina and Gourry traveling together, seeking treasure and adventure. Their journey takes them to a remote village plagued by a mysterious curse. The villagers believe the curse is tied to a legendary artifact known as the "Climax Blade," a powerful sword said to bring destruction to those who wield it.

Lina, driven by her curiosity and desire for profit, decides to investigate the artifact, while Gourry, though less enthusiastic, accompanies her out of loyalty. Their investigation leads them to a hidden temple where the Climax Blade is guarded by ancient traps and a powerful guardian. As they navigate the temple's dangers, Lina and Gourry uncover the truth behind the curse: the blade was created by a sorcerer who sought to harness its power but was ultimately consumed by it. The curse was a failsafe to prevent the blade from falling into the wrong hands.

The duo faces off against the temple's guardian, a formidable opponent who tests their skills and teamwork. Through a combination of Lina's powerful magic and Gourry's swordsmanship, they manage to defeat the guardian and retrieve the Climax Blade. However, Lina quickly realizes the blade's destructive potential and decides to seal it away, understanding that its power is too dangerous to be used. The OVA concludes with Lina and Gourry leaving the village, their bond strengthened by the experience and their reputation as adventurers further solidified.

The series highlights the dynamic between Lina and Gourry, showcasing Lina's cunning and resourcefulness alongside Gourry's straightforward yet effective combat skills. It also explores themes of responsibility and the consequences of wielding power, as Lina grapples with the moral implications of the Climax Blade. The OVA maintains the lighthearted tone and humor characteristic of the "Slayers" franchise while providing a self-contained story that enriches the broader narrative of the series.