The %73 percent of the humanity is gone. They are all dead because of an apocalypse. Sound Monsters are all around the world. Those monsters hunt every creature if they make any sound while they are around. They make a ringing sound. As soon as you hear that sound, you have to fall silent.

First you were alone, no family,no friends. You were alone in the destroyed streets. You somehow survived. But one day, they found you. Stray Kids, they found you. A group of 8 men and their leader, Chan.