The 13th Magic Tower Lord Lacia had no complaints about her life. Until she woke up in the body of Archduchess Eckhart due to her disciple's betrayal. But this Archduchess' life was a mess, and she was even said to be maladjusted to magic. She was in a beggarly situation where she couldn't use her magic power even though it was right in front of her. Lacia decided to make a medicine to improve her constitution. Just then, she caught a useful knight with a torn magic circle. Thanks to that, her plan also seemed to be going smoothly. But who would have thought that knight was Archduchess Eckhart, Calix himself. Lacia pretended not to know the Archduchess' true identity even though she had noticed it. Calix pretended to be a mere knight in order to find out her true identity. As time passed, Lacia learned of the hidden secrets of Calix and the Eckhart Duchy. Will she be able to safely leave the Archduchess' body and return to her original, perfect body?