Life in the 1920s was a great adventure. And for Mosquiton, so was death. Once a terrifying vampire, Mosquiton ends up blood-bound to a 17-year-old treasure hunter named Inaho. She is obsessed with the secret of immortality, but happens to like the sun and drinking blood is just gross. Inaho decides to drag Mosquiton around the world on a quest for the O-Parts, magic artifacts that can grant immortal life without the unpleasant side effects of vampirism. However an army of ancient monsters stands in their way, along with Mosquiton's perpetually naked ex-wife of 300 years.