What Is Square Enix’s "Prequel Trilogy" And Atlus’ Asraga Adventure Chronicle?

Instead of making sequels to one of their key franchises, Square Enix may be developing a string of prequels. Square Enix Japan registered a trademark for Prequel Trilogy for use with video games in Japan. The question is what series will Square Enix make three prequels for? Final Fantasy VII? Romancing SaGa? Kingdom Hearts? Final Fantasy XIII: Prequel Trilogy?

Also interesting to note is a trademark for Asraga Adventure Chronicle registered by Atlus. Usually, Atlus takes a couple of years to use their trademarks so whatever this is probably very early in development.