In the Soul Society, I Bound Myself to Unohana Retsu from the Start

Xuan Yu transmigrates to the Soul Society.

He becomes a low-key Soul Reaper, ready to lie flat and coast through life.

But to his surprise, he gets bound to an auxiliary System. As long as he binds himself to a Soul Reaper, he can control their training and receive rewards based on their progress.

From then on, Xuan Yu lies flat for good...

Bind Retsu Unohana to train in swordsmanship, gaining experience in spiritual pressure and healing spells.

Bind Rukia Kuchiki to train in demon arts, gaining experience in swordsmanship and Flash Step.

Bind Yoruichi Shihōin to train in hand-to-hand combat, successfully mastering Flash Cry.

A hundred years later,

Aizen betrays the Soul Society and summons everyone to battle in Karakura Town. Everyone is stunned.

The demon arts, swordsmanship, Flash Step, and hand-to-hand combat practiced by Retsu Unohana, Rukia Kuchiki, and Yoruichi Shihōin are actually enough to rival Aizen...

This novel and its characters are entirely fictional. Any resemblance to actual people or events is purely coincidental. Do not imitate.