My husband often comes home late at midnight, and our married life has long since grown cold. To become independent, Kanna decides to enroll in night school to earn a degree. However, even though it's night school, her classmates are all young people, and Kanna struggles to adapt to school life after being away for decades. One day, on the train ride home after class, Kanna meets Hajime – a classmate – and they share part of the journey together. Hajime is older than the other students and also has difficulty fitting in at school, making Kanna feel close to him. Gradually, the time they spend together – at school, in the library, on the train – increases, and the feelings Kanna thought she had long forgotten begin to resurface...