At the National Local Mascot Festival, children throughout Japan have the chance to meet their favorite local mascots. However, as the event begins, it becomes evident that the figures inside the costumes are not human—they are something far more sinister, driven by a craving for human flesh. Amidst the chaos engulfing the entire nation, Keigo Ayahara, his younger brother Makoto, and his friend Ako must now struggle to survive and preserve their humanity.