A biological sister and an adopted sister—connected through their uncle. Iori Fukushima, raised in an orphanage, was adopted at a young age into the household of her older sister, Riko. However, not long after, their adoptive parents passed away. Iori was then sent to live with relatives, but Riko harbored complicated feelings about the separation… A quiet, emotionally layered story of family, loss, and the invisible bonds that remain.