Over five hundred years ago, Unohana Yachiru, captain of the Gotei 13's Eleventh Division and the First Kenpachi, encountered the young Zaraki while searching the Rukon District for enemies to fight.
In that battle, Zaraki experienced the joy of combat and slaughter.
He believed that the woman fighting him felt the same way.
They were the same kind of people.
But in the end, Zaraki still lost.
From then on, Zaraki never encountered Unohana Yachiru again.
The next time he saw Unohana Yachiru was when he first met Ailin and challenged him.
At that time, Zaraki understood that because he had been too weak, this woman had not enjoyed their battle to the fullest.
He had been discarded!
Over the years, even though Zaraki had recovered part of his spiritual pressure through his battles with Ailin, he still felt that there was a long distance between himself and that woman.
It was not yet time to fight her.
He needed to become stronger!
So, after being defeated by Ailin this time, Zaraki decided to accept Ailin's suggestion and spend these ten years studying Sword Arts.
And in Zaraki's eyes, the only people qualified to teach him Sword Arts were Ailin, that old man, and Unohana Yachiru.
Ailin's Sword Arts were very strong, but Zaraki preferred the brutal clash of blade against blade rather than duels where one sent slashes flying from afar.
Old Man Yamamoto's Sword Arts made Zaraki feel extremely uncomfortable. He would rather swing his sword wildly than learn that old man's Sword Arts.
That left only this woman.
"What? You want to study Sword Arts under me?"
"That's right."
Zaraki did not feel there was anything wrong with asking Unohana Yachiru for instruction in Sword Arts.
"That man said my Sword Arts were too weak. If I'm