Monsters roam outside the building, and inside the Green Home apartments, no one knows what might be wandering around from the 2nd to the 15th floor at any time. Good luck surviving on your own~

The scene where the monster incident begins: Suddenly, the shutters on the main lobby door of the apartment come down, sealing the building. Most residents have come down to the lobby asking 'What's going on??'. But after facing the monsters outside and realizing the situation, they are in total chaos, building barricades and trembling in fear.