The original Corpse Party game, which laid the foundation for the sequel Book of Shadows, was released first, establishing the story and gameplay style.
The sequel and expansion to the original Corpse Party, called Corpse Party: Book of Shadows, was released, further exploring the story with new chapters and scenarios.
The game was made available on the PlayStation Portable in Japan, increasing its availability to a wider audience.
The North American release of Corpse Party: Book of Shadows brought the game to a Western audience, increasing its global reach.