The 20-year-old heroine learns that she only has 10 years to live due to an incurable disease of 1 in tens of thousands. She decided not to fall in love and not to be obsessed with living. But then, he met the hero at a local alumni association. Based on Kosaka Ruka's novel and also her true story. She died in 2017 at the age of 39 due to intractable disease.