The story begins as a bittersweet one: twin sisters Arisa and Tsubasa were separated from each other after their parents' divorce- Tsubasa goes live with her father and Arisa goes off with her mother (it's The Parent Trap all over again! What the heck? Don't these people know about custody sharing agreements?). For several years they stay in touch via letters. Things are seen from Tsubasa's point of view, primarily. She is the spirited and strong "Demon Princess" at her high school. Despite her toughness, she is actually a very thoughtful person with an innate sense of justice. She absolutely adores her sister and thinks the world of her: she's beautiful, popular, has good grades, has a boyfriend... And one day they finally agree to meet.
