47-year-old Aso Toko is asked by her ex-husband Masaoka Ryosuke to take their 17-year-old daughter Miu under her care because he is leaving for an overseas assignment in London. Toko who had wanted to take custody of her daughter, has her long-cherished wish fulfilled and her old friend Suga Yohei is happy for her. However, Toko does not have the confidence to live with Miu who is now a high school student. Although Miu also has no intention of living together with the mother who had abandoned her, the two of them meet again for the first time in 12 years in order to have a discussion. On the very day that mother and daughter are reunited, Miu’s impertinent behaviour angers Toko, and they reach an agreement to live separately with Miu staying at a friend’s house. However, Toko and Miu get trapped in the lift they took right after that and then the lift suddenly plunges. The shock from this incident causes their souls to swap bodies. As a result, the two of them have no choice but to live together. They are forced to witness each other’s daily life and secrets. While mother and daughter sling long-held feelings at each other, they try to undo the situation through a process of trial and error.
12年ぶりに再会した“母と娘”の心が入れ代わった！？ 17歳の「若さ」を持て余す母・柊子（田中美佐子）と、47歳の「老い」に戸惑う娘・美羽（土屋太鳳）。二人はお互いの人生を体験し、ありえない年齢不相応な新しい恋に
小有名氣的翻譯家淺生柊子(田中美佐子)突然接到前夫的電話，得知對方即將因公舉家搬往倫敦，而他們共同生養的女兒美羽(土屋太鳳)則因學業留在日本。12年前柊子因某種原因離開丈夫和女兒，現如今美羽對她有著深深的芥蒂。初次見面倒楣至極，母女互嗆不說，二人還遭遇電梯事故，更由此離奇導致靈魂互換！為了瞞住周圍的人，母女終於住到一起，柊子以女兒的模樣按時上學，變成老太婆的美羽則承擔起做家務、拿稿子的任務。借此機緣，美羽有機會接近一直以來暗戀的男孩元宮透(中川大志)，柊子也體會到久違的青春快樂。桃花期不期而遇，母女在靈魂互換期間似乎也加深了對彼此的瞭解……
