Super Princess

Anna Tsuyusaki, an elite high-school fencer, received a pendant from her parents as a souvenir from Europe. It has a portrait of a medieval European princess who looks strikingly similar to Anna. Later, when Anna fell asleep, she saw the princess named "Harriet" weeping and asking Anna to set her free from her political marriage. Thinking it was merely a dream, Anna agreed to exchange body with Harriet, only to find herself in a medieval castle when she woke up.