The night came into the world. Behind the protective metal wall people can feel a little bit sense of security. But they still can't help but feel anxious about the world outside these walls.
Wails and howls of monsters sounded from all directions. Some children or even adults often cry and wince when suddenly that terrifying sounds are heard.
They wonder every day in their hearts every time they look at the metal walls. The image of the moment when those metal walls would be destroyed by powerful abomination haunted their every breath.
Because of this, many of them still don't want to fight, even though they will become much stronger than themselves now. Those fears that haunt them all the time make them prefer not to do anything rather than trying to fight it.