The 20-year-old protagonist is informed that she has an incurable condition that affects 1 in 10,000 people and gives her only ten years to live. She made the decision not to get romantically involved or become life-obsessed. But later, she ran into the hero at a neighborhood alumni gathering. based on both the novel and the true story of Kosaka Ruka. She passed away in 2017 at the age of 39 from an incurable illness.