Princess Sheila, a skilled but overly curious knight, accidentally unsheathes the legendary cursed sword Dáinsleif while sneaking into her kingdom's treasure room with her childhood friend, Eric. The blade triggers an erotic curse that manifests the deepest fantasies of its wielder, plunging Sheila into a state of uncontrollable arousal. As Sheila struggles with her new condition and the teasing discipline of her mentor Nina, she finds herself at the mercy of both her own desires and the unpredictable nature of the curse.
Sheila continues to battle the erotic curse of the sword Dáinsleif, leading to a humiliating encounter with Nina and a subsequent attack by a lewd slime monster. When Eric and Nina rescue her, they discover the sword's seal is rapidly weakening. To prevent a catastrophe, Nina directs Eric to engage in a sexual ritual with both her and the princess to gather the fluids needed for a restorative potion.
Bound by the erotic curse of the Dáinsleif sword, Princess Sheila is forced to wear a revealing, skimpy set of armor under the guidance of her mentor, Nina. As the trio travels, the princess's embarrassment clashes with her intensifying desires, leading to passionate encounters between Sheila, Nina, and Eric.
After being mocked by the very travelers she saves for her revealing attire, Princess Sheila must find a way to reseal the cursed sword Dáinsleif. Guided by Nina, Sheila and Eric engage in a passionate encounter to satiate the blade's erotic hunger. As they work to quiet the weapon, Sheila and Eric finally confess their love for one another, culminating in a three-way union to secure the sword's seal.