My Family Wanted Me To Die For My Adopted Sister

Everyone in the household can see a floating countdown hovering above Vivienne, the adopted sister of the narrator, and it reads 100 days. Once the number appeared, the family fell apart with worry: the mother cries through the night, the father hires the best doctors in the city, and Luca writes a list of every place Vivienne has ever wanted to go. The narrator is left watching a household that has decided its only task is to repair Vivienne's regrets before time runs out.