1. (Mobile Phone) Before Crisis - ShinRa: Everything started with Shinra (Organisation). An alien came from the skys and started a big war. Shinra managed to catch this alien and made experiements with it. They tried to grow up humans with the power of JENOVA (Alien). Shinra used big Mako Reactors to provide enough energy, those Mako Reactors were draining the Lifestream of the Earth and the Earth was slowly dying. Sephiroth was born, it was a big ''success'' for Shinra.
2. (PlayStation Portable) Crisis Core:
The story of Zack, Cloud and Last Order.
Not released yet...
Main character: Zack
After unknown time...
3. (Playstation 1) Final Fantasy VII: Sephiroth was