Sounds like Dissidia 012[duodecim]: Final Fantasy will have a robust single player mode. The PSP pre-sequel has new episodes with characters like Lightning and Laguna plus the entire storyline from Dissidia: Final Fantasy.
You’ll be able to play through the previous PSP game’s story using assist moves and other revisions made for Dissidia 012[duodecim]. Past episodes have newly created short scenarios to play too.
Dissidia 012[duodecim]: Final Fantasy also lets players make the fanfic of their dreams. You can make and exchange original quests in Dissidia 012[duodecim]: Final Fantasy. It isn’t clear how players distribute quests, but leaky retailer Game Star says quests can be shared across the country. Battle for Tifa’s heart scenario, here we come!
Square Enix included a data import feature where your save file from Dissidia: Final Fantasy or Dissidia: Final Fantasy Universal Tuning can be carried over. All character levels are retained in Dissidia 012[duodecim]: Final Fantasy plus you get a special accessory as a bonus.
Dissidia 012[duodecim]: Final Fantasy is slated for March 3 in Japan and it’s one of Square Enix’s Q1 titles in the West.