Hyuga Neji could hardly be blamed for asking that question. Anyone in the Shinobi World today, other than Uchiha Chisen, would probably have been dumbfounded by Hyuga Hiashi's words.
After all, as far as the people of the Shinobi World knew, their world was all there was.
"Just as you thought, the sky beyond this land of ours is what I meant by outside the Shinobi World!"
Since Hyuga Hiashi had decided to tell Hyuga Neji the secrets known only to the head of the Main Family, there was no reason to keep him guessing.
"According to the ancient traditions of the Hyuga Clan, we weren't originally a shinobi clan from this world. We came from the moon!"
"And on the moon, there's another branch of our distant relatives!"
"Or rather, our Hyuga Clan should be called the Ōtsutsuki Clan!"
"You remember Hinata's third birthday, don't you?"
"Those relatives from the moon came to see Hinata that day!"
As though the shocking revelations he had dropped weren't enough, Hyuga Hiashi even told Neji every detail of Otsutsuki Toneri's visit to Earth when Hinata was three.
"They can come to the Shinobi World..."
Hyuga Neji began to understand Hyuga Hiashi's concerns. If every member of the Hyuga Clan were branded with the Caged Bird Seal, that branch on the moon might gain complete control over whether they lived or died!
"They can do far more than come to the Shinobi World. The Hyuga Clan's Caged Bird Seal was developed specifically to guard against them!"
"According to our clan's records, several hundred years ago, that branch on the moon massacred our people. Left with no other choice, our ancestors developed the Caged Bird Seal."
"That way, even if those relatives on the moon wanted to massacre us again, the Main Family could