Corpse Party: Book of Shadows is not a sequel in the traditional sense. If anything, it is more of an expansion on the original game. I would say that it is similar to DLC but considering that the game is twice as long as the first game that would be rather demeaning. That does not mean Book of Shadows is bad though. Book of Shadows does do a nice job at telling an engaging story and an eerie atmosphere, albeit not as well done as the first game. What Book of Shadows does not do well at, however, is advancing the main story of the Corpse Party series. It certainly adds a lot of background to the Corpse Party mythos though, and it will satisfy fans of the first game as long as long as they are not expecting a full blown sequel.
In concept, Book of Shadows starts out with what one would actually expect to be a unique continuation of the first game’s story. The opening cutscene shows the depressing aftermath of the first game’s ending for where reality has been altered so that everyone who died during the events of the first game has never existed in real life yet the remaining cast members still remember them. This is shown to be particularly bad for Naomi Nakashima who is shown falling into clinical depression in the game’s opening cutscene. Strangely enough, this is the only part of the game that takes place directly after the first one until the game’s final chapter. Instead the chapters seem to take some really strange directions and seem to be as far from advancing the main plot as possible.