In these earlier adventures of Lina Inverse and Naga the Serpent, discover how the two rivals first met. During their initial adventure, the rivals encounter each other and stumble upon a vampire while on a rescue mission. Next, Lina is hired to serve as the bodyguard for Sirene, the daughter of a wealthy man. Lina is initially very enthusiastic about the job, as she is being paid very well, but Sirene keeps spending all of Lina's first half of her pay. (She receives the other half later.) Lina orchestrates a fake kidnapping to teach Sirene a lesson, but when Sirene is actually kidnapped, Lina must team up with Naga to save her. In the final episode, Lina and Naga find themselves on separate sides in a fashion war.