Lina Inverse and Naga the Serpent work three separate jobs across this OVA's three episodes. The first has them meeting for the first time, on a rescue that runs into a vampire. In the second, Lina is hired to guard a wealthy man's daughter, Sirene, who burns through the advance so fast that Lina stages a fake kidnapping to teach her a lesson, and a real abduction happens instead. The third puts the two of them on opposite sides of a fashion dispute.