Spoiler:
" 498 YEARS BEFORE ".The Northern Cave. An elicopter with the Turks on board flies over it, sent by the Shin-Ra to retrieve a precious " object " that was supposedly left there (Jenova' s head) . We see the elicopter descend, and then we just hear the voices of the Turks in alarm, just like they found something unexpected and dangerous down there.
" What the... "
" Be careful, it' s... "
Shots from a machine gun are heard, then other voices, among them Elena' s:
" Senpai, watch out... aaahhh "
And then silence.
Marlene, with her candid voice, speaks of the events that occurred two years before today, events that involved the Planet and all life on it, while a Gregorian Chant (the same on the official Japanese website) plays in the background.
" Lifestream. It flows all around the Planet, and it' s the origin of all life forms. The origin of everything. The Shin-Ra company exploited the Lifestream to turn it into an energy source, improving our lives.
But there were people who believed that by draining the Lifestream from the Planet, the Planet would wither and die. Those at Shin-Ra tried to silence those voices of protests that opposed them. And therefore, SOLDIERs were created by infusing the cells of the Calamity from the Skies, that had fallen into the Planet many years before.
And among them, the greatest of all was Sephiroth. However, he soon discovered his true, cursed origin. And because of that, he began to hate Shin-Ra... then he came to hate everything... Shin-Ra as well as those fighting for the Planet.
Sephiroth, drenched in hatred, began his scheme to destroy everything... And those who were struggling for the salvation of the Planet confronted him... Everyone was entangled in a bloody war.
It was then that the person we all cared most for perished, becoming one with the Lifestream.
Then the Planet, in order to stop its enemies, used the Lifestream and created WEAPON with it. The Lifestream gushed out and enveloped the Planet, and every feeling was enveloped the same way... hate... sadness... sorrow... ambition...
They said to me that sadness was the price for the Planet to be saved.
But it seems the Planet is way angrier at us than we ever thought."