DVD: .Hack//Sign 4: Omnipotence
After the battle at the upside-down castle, everyone but Tsukasa is returned to a regular field in "The World". Did Tsukasa die? What happened to him? Captured by a previously friendly unseen force, Tsukasa reappears with parts of his memories, thoughts, and feelings "missing". Is this really Tsukasa or just a copy of the character's data?
The other players have their own problems as well - Subaru discovers that the Silver Knight have been hiding messages from her with the latest request by the System Administrator threatening to end with disastrous results!