In the peaceful village of Hinamizawa, Rika Furude and Satoko Houjou have been inseparable since childhood, sharing countless happy moments with their close group of friends. As they grow older, Rika sets her sights on pursuing her dreams, hoping Satoko will accompany her on this path.
Despite her own doubts, Satoko chooses to support Rika's ambitions. However, reaching these goals creates a rift between them. Rika thrives in her new surroundings, making new friends, while Satoko feels progressively more alone.
Overcome by nostalgia for the simpler days in Hinamizawa, Satoko sinks into a profound sense of loss, yearning for things to return to how they used to be. At her lowest point, a meeting with a supernatural being changes Satoko's outlook, uncovering hidden truths about Rika. Driven by these revelations, Satoko begins a mission to reclaim the future she desires, no matter the cost.