Nin, a young woman and heir to an apartment complex, finds herself facing the wrath of a guardian snake spirit. One by one, the building's residents begin to move out until it is nearly deserted. A horde of snakes invades the premises, attacking and even killing those who remain.

Sadayu, a doctor from the emergency response unit, is urgently called in to deal with the escalating crisis. However, the situation spirals out of control, leaving chaos in its wake. Those who survive are forced to band together, fighting for their lives in a desperate bid to endure the terror and survive the ordeal.