A prison. Inside are an honest, pleasant young man, an alluring woman, a middle-aged ex-soldier, a geeky woman who still looks like a child, a mysterious old man, and a cat. The story takes place in an isolated detention facility in an unknown place. One day, the facility suddenly loses all power. All of the locks open and the prisoners meet each other while gaining their freedom. However, there are no longer any guards in the compound. Why were they released? Is there no one else there? Everything is enshrouded in mystery. Inevitably, they attempt to escape from the prison, but they can’t seem to find an exit. The mysterious old man begins acting strangely when suddenly the facility meets with a crisis! What is happening to this place? And what will the fate of the prisoners be?!