Yūna, younger sister to poet Rei, survives infection during Japan’s zombie-plagued collapse. Both siblings enter the government’s triage system that extends care only to those deemed curable, exiling the rest to quarantined districts. When containment fails, their physician, Rika, secures passage overseas with smuggler Takeshiba. Rei instead chooses to return home to meet death, and Yūna insists on sharing every step of Rei’s final pilgrimage. Their path winds through desolate landscapes haunted by unspeakable horrors. While the narrative centers on Rei’s determination to perish where she lived, Yūna emerges through silent companionship — a sister’s steadfast presence illuminating humanity’s fragile light amidst civilization’s collapse.