Kitazawa Nao is a 34-year-old doctor. Nao met fellow doctor Ihara Yuichi through matchmaking and decided to get engaged with him. She has been doing well both in work and in private life. 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, and at the same time, Nao is diagnosed with Early-Onset Alzheimer's disease.