>>1670351He isn't brainwashed, and it ends up not even being an MMO exactly. Alicization is actually probably my 2nd favorite out of the whole series.
If it convinces you to keep going, all of the NPCs around him aren't really NPCs, but souls designed to be placed inside of killing machines to be used for a war, and it's being run by the government and then abnormalities happen and one person ends up being in power, etc.
It's actually a pretty interesting read.