Once the sun sets, monsters devour people, demons laugh, and a terror so deep it overshadows even street murders and bandits envelops the town. Walking alone late at night is synonymous with stepping into one's own grave. —That night. Kanae, who had stayed late at school, was hurrying through a deserted alleyway.

Just a little further to the house. At the very moment he felt that relief, the darkness shifted with a rustle. A foul-smelling breath brushed against his neck, and before he could even turn around, a massive shadow lunged at him.

It was a monster. Sharp fangs closed in before his eyes, and Kanae collapsed to the ground. Even as he tried to flee, his legs trembled, and he couldn't even squeeze out a scream. The monster opened its maw wide to ensure its prey wouldn't escape, about to bite down as the stench of rot wafted from its throat—. In that split second, a figure appeared, as if tearing through the darkness.