Xenoblade/Xenogears roleswap. A long time ago, there used to be two titans, Deus and Solaris, locked in a protracted war. But just as the cycle of bloodshed was about to be broken, the shocking truth that lies beneath was revealed.
Nami and Elly have been best friends since childhood, and upon their reunion, they decided to have an adventure on their own.
Sakura has a vendetta against Elly. After fighting against her in the canyon, she will teach her to know on what's it like to be friends with land dwellers.
Extrapolated post-game musings about an unexpected (non-romantic) relationship, and an examination of the convoluted parent/child relationship between Citan and Midori. Otherwise, there are references to only canon ships and events as discovered in the game and the Xenogears Perfect Works guide. Please note that there are game SPOILERS throughout the story.
Sasuke is on a mission to get the 'Drive' for Orochimaru, and knows Elly has it.
After freeing her from the influence of a drug known as the 'Drive', Edward and Alphonse go with Elly to Solaris to get to know her place, but also find some way for their adventure to happen here.