After destroying Shabranigdo, Lina and Gourry continue their journey. They hear a rumor about the first successor to the throne, the prince of Seyruun Kingdom. Lina dreams of marrying a wealthy young man, but the prince turns out to be a forty-something scruffy-looking man. Phil, the prince, offers a bodyguard job to a disappointed Lina. Lina reluctantly accepts the offer. Then Randy, who is the third successor to the throne, appears with his loyal subordinate, Brassdamon. Randy has a plot to kill Prince Philionel. Lina meets Amelia, Phil's daughter, who is a self-proclaimed Lady of Justice. Amelia punishes Randy for treason by slashing Randy with the help of her father. Lina can't help but to wonder why they hired Lina as a bodyguard in the first place.

Lina, Gourry, Amelia and Sylphiel get to Rezo's museum. They break the seal by the Sword of Light and look for Rezo's secret in the underground chamber. They are caught in a trap set by Eris and become separated. While Lina searches for Gourry and Amelia, Sylphiel asks her about her relationship with Gourry. She tries not to show any feelings for Gourry other than a mere friendship. In the meantime, Gourry is in the middle of man-to-man battle with Zangulus. He is cornered by the strong opponent but Gourry uses the full force of his Sword of Light and defeats Zangulus.

The group manages to search around the home, and find a hidden room in the attic. By this time, Halcyform has already been defrosted.

They escape his wrath when Lina makes a whole in the ground around them. They land in a sewer like place in the home, where slugs are present. Lina gets scared and hang on to Gourry. They proceded to get transported to another place by Saygram, while Zelgadis and Amelia fight of the slugs. Then Amelia and Zelgadis manages to get kidnapped.

Shortly after, Lina and Gourry runs away after being transported and end up in a lab. They see a woman laying there, and Halcyform shows up. We learn his back story, why he is doing this. He is trying to bring back the love of his life, Rubia (the woman in the box) after monsters attacked them, and he wasn't unable to save her.

Amelia and Zelgadis shortly appears, wrapped up in a cococun, they fall into the pool, where they lose their energy, giving it to Rubia.

Lina figures out where the pledge stone is, and