A law enforcement unit directly under the government, commonly known as BRIGHT. Makoto Kurosumi, a carefree member of the unit, is taken by the cool Deputy Captain, Kuina Sahajo, to a mysterious underground facility. It was a den of evil where monstrous creatures roamed. To make matters worse, a cave-in blocked the entrance, trapping the two of them in a labyrinth with no cell service. The only ones they can rely on are each other. A survival mission begins for this polar-opposite pair—a superior and her subordinate—with their lives and escape on the line…