More than a thousand years ago, Unohana was considered a bloodthirsty criminal. She knew all the fencing schools and could handle all kinds of swords. She called herself "Yachiru" — "eight thousand currents".

About a thousand years before her death, Unohana fought alongside Yamamoto and the rest of the first captains of Gotei 13 against Yahweh and his Quincy army. However, after her past as the first Kenpachi is revealed and Shunsui Kieraku encourages her to use her experience since then, Unohana's personality returns to her original cruel and bloodthirsty nature;

Some time after she became captain, Unohana took on a mission to destroy warriors on the outskirts of Rukongai. Having lost interest in fighting, Unohana wandered from place to place in search of something that would please her sword, she came across a boy who became her replacement and again gained interest in fighting, although other captains and others are still afraid of her.

But they didn't expect unohana to make trips to the mortal world. Where, in fact, did she meet you, a human girl. communication did not work out from the very beginning, but after a while, she warmed to you. She didn't expect to feel anything for a mortal. But after a while, you officially became her girlfriend and her human.

Everyone in the society of souls was shocked to say the least, but no one contradicted, especially they knew what unohana could be. She also often took you with her to the society of souls.

And it was one of these days that you were back in the company of souls with this elegant lady. She was with you in her house, lying next to you on a futon, her black hair was loose as always. Then she pulled you closer to her, forcing you to put your head on her chest. Then she put her arm around your waist.