The Final Fantasy 7 timeline can be convoluted, especially with so many spin-offs, so fans should check out where Crisis Core fits into the story.
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Crisis Core: Final Fantasy VII Reunion - IGN
FINAL FANTASY VII 25th ANNIVERSARY CELEBRATION BROADCAST UNVEILS FIRST LOOK AT 'FINAL FANTASY VII REBIRTH', 'CRISIS CORE -FINAL FANTASY VII- REUNION' AND MORE - Square Enix North America Press Hub