O jogo é uma visual novel de mistério de assassinato com um foco pesado na história que requer várias jogadas para descobrir e envolve salas de quebra-cabeças usadas para progredir na história, com escolhas de diálogo a serem feitas entre elas.

"De algum lugar distante, Junpei podia ouvir o som de rangidos de metal. He felt his stomach tighten. There were a thousand things the sound could have been, but none of the things he could think of were good. In an attempt to distract himself, Junpei looked around the room once more. Set in the wall directly in front of him was a slightly dirty iron door. The first thing Junpei noticed about the door was the number roughly emblazoned across it. On the surface of the door, in red paint, someone had written... 5"