If you don't have a game save the old man (Unoma a recruitable member of Julian's army) asks you questions about whether you had this party member or that one. So you can access the battles with a save from any of the scenarios but I'd wait. The team you get without a save is pretty underpowered for the tasks at hand.
There's all sorts of Japanese stuff of the PD, commercials, the two endings, etc
(Hey my 500th post)

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