Hashimoto Taichi is a third year university student with no specific objectives in life. One day, he sees a girl standing on the roof of the university building. Thinking she may be trying to commit suicide, he dashes over to stop her, forgetting his phobia of high places. When he finds her, he embraces her. In return, she yells: "Are you an idiot? Do I look like I'm about to commit suicide?" and runs off. A few days later, Taichi meets the girl -- Mioka -- again and slowly starts to care about her. What he doesn't know is that half a year ago she was diagnosed with a life threatening disease.