True Waterfall.
It was not merely a place for Perfect Jinchuriki training.
Otherwise.
Darkness would not have appeared in Yagura's heart.
Moreover, Motoi had also let Orochimaru enter the True Waterfall.
This proved even more that... becoming a Perfect Jinchuriki did not necessarily require going through this place.
Hyuga Sho had speculated about this before.
One of the purposes of the True Waterfall... was to "recognize oneself."
It was equivalent to an auxiliary version of Izanami.
It would not trap the practitioner in genjutsu.
Izanami, however, could cause someone to starve to death.
If someone became trapped in an Izanami state, stubbornly carrying out a certain thought over and over again within the illusion.
Although the genjutsu could not inflict real harm on them.
Their physical body in reality might eventually die of thirst or starvation because they neither ate nor drank.
So...
Rather than calling it Perfect Jinchuriki training.
It would be better to say...
The True Waterfall was meant to counter Izanami.
Anyone who passed through the True Waterfall.
Would reconcile with the darkness in their own heart.
Forming unity between spirit and flesh.
They would no longer be lost, their will would be firm, and they would understand themselves.
Izanami could not take effect on someone like that.
In other words...
Killer B, Naruko, and Orochimaru, all of whom had passed the True Waterfall's trial, already possessed the ability to resist Izanami.
"Speaking of which... it reminds me of Yūhi Kurenai's genjutsu resistance training... and Uchiha Itachi's Tsukuyomi."
Hyuga Sho mused.
If this place was viewed as a training instance.
Then... everything made sense.
However...
"What was that momentary auditory hallucination Naruko just experienced?"
Hyuga Sho was certain.
Before Naruko passed the True Waterfall training, she had experienced an auditory hallucination.
When Motoi or someone else was