一个是八十岁的老人，卧病在床六十年，突然相信自己只有二十岁，自己已经年老的现实只是一场梦。另一个是十八岁的少女，为生计到老人的家当帮佣，意外地，女孩的样子像极了老人二十岁时的梦中情人……

Meet NIPPORI Ayumu, an 80 year-old man, who, due to a serious heart condition, has spent sixty years of his life confined to his house. One morning, he wakes up believing himself to be twenty again. In his mind, he has become the youthful young man that he once was. However, reality fails to keep up with his illusion, and everything around him seems to be quite different from what he is used to. So, he decides that he is simply dreaming. As his reality becomes his dream, his unhappy world turns into a life enriched with happiness and expectations for the future. Ayumu is now enjoying his life to the full again.

나리스(이케와키 치즈루)는 80세의 괴퍅한 할아버지 닛포리(이세야 유스케)의 요양 도우미 일을 하게된다. 닛포리는 치매때문에 스무살의 기억으로 돌아간 채로 살고 있다. 현실에서 행복하지 못한 삶을 살고 있는 나리스에게 닛포리는 꿈과 같은 첫사랑의 모습을 느낀다. 꿈속이라 믿으며 행복을 얻고 싶어하는 닛포리와 방황하는 청춘속에서 행복을 외면하는 나리스는 서로를 통해 무엇을 얻게 될까?