Kitazawa Nao is a 34-year-old doctor. She is busy working at a clinic. Nao decides to get engaged with fellow doctor Ibara Yuichi. She is not madly in love with him.
One month prior to her wedding ceremony, Nao has a fateful meeting with Mamiya Shinji. He is an unsuccessful novelist and also holds a part-time job. They fall in love with each other, but Nao is diagnosed with Alzheimer's disease.