Our heroine Emma supposedly drowned in a lake in Paris at the age of 10 and lost all her memories after being rescued. Her father had already been dead due to a prior accident, and her mother then died from an illness so she was adopted by the Vansan family. They moved away from Paris to live with just Arnaud and his mother Alice, and the father, Daniel an army general, was left working in Paris. So basically Arnaud is like her childhood friend she was raised with for the last 7 years. Turns out that Emma is actually witch as well, but she lost her magical powers after the accident. One day she stumbles upon a traveling amusement park called Reve and when she goes there she meets the owner named Hugo who knows that she’s a witch. He tells her that everyone in there including himself is trapped inside and can’t get out without a powerful magic spell, and so he asks Emma to save them. And so Emma becomes an employee of the park, trying to awaken her magic to free everyone in there.