[deedlit]

Originally Posted by tomtkp

Spoiler for Answer:

It's not the ending as what deedlit said. it's just the ending of the first half of Alicization.

It was Kirito himself that became a "retard". It was some procedure from the US invaders that caused some electric current to flow into Kirito's STL and destroyed his sense of self in the process.

Yes, Asuna and Kirito did reunite but it was the heartbreaking moment in the story.

Spoiler for Oops:

Oops, my mistake. The person started out talking about asuna, Alice and how cute ロニエ is in that exchange of certain information and went on to answer what happened to kirito, and all the way up to the end where 3 went back to UW.

Are you talking about the part where kirito woke up?