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. Enter KODAI Narisu, an 18 year-old home-care worker who is newly assigned to look after Ayumu. To his great surprise, Narisu looks exactly like the girl he had fallen for when he was twenty and he immediately mistakes Narisu for her. Narisu, on the other hand, is trying to deal with her own secret love. She is living amidst the uncertainties of youth, struggling to find her way... 奇妙的世界观。 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……
