♔ Sword Art Online Vol. 7: Mother's Rosario
"Since Absolute Sword's so strong, is it possible that... it's someone from SAO?"
In response to the whispered question, Lisbeth nodded with a
serious expression on her face."I suspected that. But when I
asked Kirito what he thought after his fight with Absolute
"What did Kirito-kun say...?"
"He said that there was no way Absolute Sword was originally a
SAO player. His reason being..."
"He said that if Absolute Sword existed in that world,
«Dual Blades» would've been given to that person instead."
-Mother's Rosario ,Chapter 1