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You have the prologue, that is a direct sequel to the "Good ending". Then, 7 chapters of "what would happen after that bad ending" and some background of some characters you encounter during the first game. At last, and if you cleared the first game, you have chapter 8, that is a sequel to the "Good ending" (dunno if it is before or after the prologue). It ends with a: It'll continue in the next Corpse Party.