With her husband coming home late and their marriage long since cold, Kanna enrolls in night school to earn qualifications and become independent. Most of her classmates are younger adults, leaving her unable to fit into school life after decades away. One evening she rides home with Hajime, an older adult classmate who feels just as out of place. Their shared loneliness draws them together at school, in the library, and on the train. As they spend more time alone, long-forgotten feelings awaken and develop into a passionate affair that makes them lose all track of time.