Ultraman Otome: The Mission of Pandora's Box

At eighteen, Isadani Elodie goes to Japan as a short-term exchange student. Influenced by Hikari Rei and troubled by questions about her own origins, she joins the UPG Special Search Team to investigate supernatural phenomena. During an operation to capture an alien, she loses her family and perishes in the sea. When she wakes again, she finds herself on the planet Pandora, as Katia Stewart, Grand Duchess of the Titan Dynasty. After learning that her parents died because of the war between the races of the Land of Light, she vows revenge. Using her judgment and leadership, she stabilizes her faction, disguises herself as a man under the identity Anton August, and infiltrates the Land of Light as an envoy of the Titan Dynasty to gather intelligence and prepare thoroughly for war. After the war ends, her aunt arranges for her to marry Mold, the Great Sovereign of the Gu'a Empire, drawing her into a series of schemes and intrigues. Her aunt dies under mysterious circumstances, and Katia becomes heir to the throne, making her a target for even more people. Under immense pressure, she chooses to endure it all and marry Mold, then vanishes from public view as she plans her revenge. After settling her feud with the three vengeful spirits, she faces another test of fate: she bears the mission of destroying humanity. Once possessed by a demon, even her beloved is forced to make a choice. Will he kill the woman he loves to save the world, or save her and let them perish together? What will become of the ghostly blue phantom still entangled with her? And why has the sudden arrival of the Absolutian Tartarus thrown time and space into chaos?