Tragically orphaned by an automobile accident, the Kasugano twins travel to their grandparents\' countryside residence via railcar, hoping to reconstruct the shards of a shattered life. With an uncertain future, Haruka Kasugano clings to memories of the past, hoping to find the strength he needs to protect his ailing sister.

With a destiny irrevocably tied to that of another, Sora Kasugano clings to moments of the present, drawing comfort and security from the company of her brother. Two lonely souls so physically alike, yet spiritually divergent, unaware of the challenges these conflicting expectations will unveil in the days to come.