According to Square-Enix,
In WORLD OF FINAL FANTASY, players will lead a pair of twins, Reynn and Lann, on their journey through the world of Grymoire on a search to rediscover their lost memories. Throughout their journey, players will collect, raise and battle with the adorably familiar beings throughout the world including cactuar, chocobo and behemoth to customise and stack their army of monsters to create strategic tower combinations and take on even the most challenging of opponents.
You can view a video for the game below:
World of Final Fantasy – E3 2016 Trailer
World of Final Fantasy will come out for the PlayStation 4 and PlayStation Vita on October 25, 2016.