Nightfall Rules

Worldview reconstruction: The story takes place in "Yuanhai City," a modern metropolis shrouded in thick fog and eerie rules. In this world, "Gui" are the concretization of idealism and cannot be physically destroyed; only by mastering "Gui" can one fight against "Gui." In desperation, humanity established the "Night Watch Bureau" to maintain order on the brink of collapse, but those who control Gui will ultimately descend into the abyss of losing control and resurgence. — Description from novelcodex.org