You are trapped in a nightmare and lost in the "deep world of depression" created by the darkness of your heart. It is a place different from reality, a place where your inner suffering is embodied, and your goal is to escape from it.Players will progress through the game by solving puzzles set in various stages, and will have to confront the trauma hidden within them. The fears and anxieties caused by past events will stand in their way.The setting for the trauma is everyday places - convenience stores, trains, stations, hometowns, tunnels, etc. By overcoming the strange happenings in these spaces, you will overcome the darkness in your heart and achieve a new awakening. You will embark on a journey to overcome your own fears.