? which series ending? SIGN or "DUSK"
I'll assume SIGN since you mentioned Sora.
SIGN ended with them able to awaken Aura and with Tsubasa able to awake in the real world again (that was her stepping out of the hospital, and Subaru in the wheelchair) Right before that, Sora was Data Drained by Skeith, causing him to go into a coma and be stuck in the game. Morganna then ordered Skeith to go after Aura, and manages to get into Helba's Net Slum. Helba then forces everyone to log out so Skeith can't do anything to any of them.
The way the series was ended, and the way it aired in Japan, was to lead into the first game (the last episode aired right before the first game became available). at the beginning of the first game Orca (Balmung's friend, the other Descendant of Fianna) is out with your character, Kite, who he just got to start playing(your character and Orca go to junior high together), and the newbie dungeon they go to to train you they run into Skeith chasing Aura right after they left Net Slum, and Aura gives Orca an item to fight Morganna, but Skeith then data drains Orca, causing him to go into a coma IRL. Aura then gives the item to you instead, and from there things begin.
*is currently waiting for news on the new .hack anime*