In the winter of his freshman year of high school, Akito Hayasaka is diagnosed with a heart disease and is told that he has little time left to live. In the face of despair, Akito meets Sakurai Haruna, a patient at the same hospital. Haruna also has only little time remaining to live due to a serious illness. Akito begins to talk with her, hiding his own illness in the process and slowly becomes interested in Haruna, who says that she’s not afraid of dying. "Is it still possible for me to fall in love?” The days that pass by as they ask themselves these questions, slowly change. The ultimate novel of pure love, featuring the fleeting beauty and sweetness of their daily lives depicted in a gentle manner.