Rika Furude and Satoko Houjou are close friends who have spent their whole lives in the little town of Hinamizawa. They spend every day together, along with their other pals, and every moment is full with laughing and joy. However, as Rika and Satoko grow older, a once-in-a-lifetime chance presents itself to each of them. Rika is motivated to pursue her aspirations and want to have Satoko by her side. Satoko, despite her reservations, chooses to accompany Rika on this journey. The fulfilment of her ideal, however, causes a schism between them. As a result, the sisters are in entirely different worlds, with Rika enjoying her new life and gaining new friends while Satoko becomes increasingly alienated.