In the Naruto World, ordinary sealing jutsu—even Eight Trigrams Sealing—could not prevent a tailed beast from sensing the outside world, no matter how secure the seal was.
That was true of the seal inside Naruto in the original story, as well as the one currently inside Minato.
Those seals merely confined the tailed beasts in cages; they could not stop them from sensing what was happening outside.
So Uchiha Yin had two things to do.
Or rather, there were two methods he could use.
The first was to reinforce the cage, turning it into an enclosed prison that blocked all perception of the outside.
The second was to enter Rin's body and directly cut off the Three-Tails' senses.
Uchiha Yin chose to use both methods at once.
As Uchiha Yin poured his chakra into her, Rin felt as though she had arrived in another world in an instant.
Where was this?
Rin turned around, looking at her surroundings.
An expanse of lush green stretched around her, like a boundless grassland.
"This is the world inside your body, or rather, your inner world. Over there is where Isobu is confined."
Uchiha Yin suddenly appeared beside Rin and spoke.
Much like the sewer prison inside Naruto in the original story, this was Rin's inner world.
But while Naruto's was a sewer, Rin's was an endless grassland.
"This is my inner world? It's so beautiful." Rin stared blankly for a moment before speaking.
"Since you're so beautiful, Rin, of course your inner world would be beautiful too," Uchiha Yin replied with a smile.
A radiant smile spread across Rin's face.
She loved hearing Uchiha Yin praise her and never grew tired of it.
"All right, back to business. That should be where Isobu is sealed," Uchiha Yin said, pointing to a small lake