This is a short horror game that does not include anything other than "opening doors" and "walking." There are no elements like ``escape from monsters'' like in traditional horror games. Just listen and walk. We put a lot of effort into the sound, aiming for a worldview that is both normal and somewhat crazy. There is no troublesome reading material at all. What you feel is correct and true. Enjoy the sound of "silence" and the voice that echoes in your head.