In a twinkling of an eye, Mary (Juliet Binoche Juliette Binoche) is already a 40-year-old woman who wakes up one day and loses all her memories of the previous 15 years. In other words, from a memory point of view, 40-year-old Mary is like a 25-year-old girl. Mary was shocked to look at her life and the whole world at the age of 25. The hot boyfriend Paul (Matthew Casowitz Mathieu Kassovitz) has become her husband; the obscure transparency in the workplace is now a corporate executive, living in a luxury mansion with a view of the Eiffel Tower. In fact, the relationship between Mary and Paul is long gone, and they both have extramarital affairs. Now, when Mary once again looks at Paul with the fiery eyes she had at the age of 25, can the relationship between the two be revived?