It is 1983, and Hinamizawa has been quarantined. A strange and lethal virus has surfaced in the village, leaving its inhabitants—teenager Keiichi Maebara and companions Mion Sonozaki and Rena Ryuuguu—confused, terrified, and desperate for answers in the face of an impending catastrophe. As the townspeople search for a cure, some devise extreme measures, forcing Keiichi and his friends to plot an escape from the besieged village before the disease claims them all in the dark. When the tension peaks, some members of his group risk losing everything as they battle for survival against both visible foes and unseen threats in the night and fear.