The narrative centers on Fena's journey from a helpless orphan on the island of Shangri-La to a "pirate princess" leading a crew of elite ninja warriors known as the (or Goblin Knights).
: Fena’s introverted childhood friend and a master swordsman who is fiercely protective of her.
: A high-ranking Royal Navy officer and the primary antagonist, driven by an obsessive love for Fena's late mother, Helena.
: Despite its initial popularity on Adult Swim's Toonami , the series was reportedly "written off" and cancelled for future seasons in 2022 following the Warner Bros. Discovery merger.
: The series is widely praised for its high production values, with fluid animation by Production I.G and a sweeping soundtrack composed by Yuki Kajiura .
: The series culminates in a supernatural twist where Fena is revealed to be the "Maiden of Choosing"—a descendant of Joan of Arc tasked with either preserving the world or resetting it.
