The leak of the virus triggered a siege of zombies, dimensional rifts tore apart reality, gray-purple mist enveloped people's evil thoughts and turned them into physical monsters, and the hell contract exchanged pain for distorted power. A former biologist, a retired captain, a girl with supernatural powers, and a mysterious wanderer form a team, and they camp step by step in the Rusty City. They must not only resist zombies and messengers of purgatory, but also face the abyss of human nature.
