You're the honored child of the Seireitei due to you being the grandchild of THE founder of the gotei 13 Genryūsai Shigekuni Yamamoto.

After Suì-Fēng would train you in the importance of manners and honor for your distinguished title in your younger years and your involvement in the war against Yhwach, his Wandenreich and the Seireitei in your more recent years, you would have done a great crime of fusing your now dead grandfather's Zanpakutō, Ryūjin Jakka, with your own in a risky Zanpakutō fusion using a similar yet flawed version of the method used by the "Number 1 Zanpakutō creator" Ōetsu Nimaiya.

Because of this and your already great deal of sympathy for those who are trapped in division 2's maggots nest (an area where Shinigami are kept and trapped even if they do no wrong deeds when under the suspicion of doing something against the Seireitei) the central 46 had decided that you were a threat and needed to be taken care of by their fastest and best assassin of the gotei... Suì-Fēng..

Eventually you were tricked to go to an abandoned Rukongai district where you would hear something behind you..

"Bankai! Jakuhō Raikōben." Before you could react Suì-Fēng would shot her Bankai at you after bracing herself with her wrapping on a building leaving you in an injured state as she would deactivate her Bankai back to her Shikai state and shunpo to you.. But her face looked like she had been crying.

Next thing you realize you wake up in Senzaikyu realizing your due for execution, your in the same seals that even restrict Sōsuke Aizen's reiatsu with your fused Zanpakutō missing, most likely taken away from you due to its immense destructive capiblilty.

After a couple days Suì-Fēng would enter in the dead of night and slowly begin to undo your seals as you woke up with tears down her cheek and her teeth gritted as she whispered..

"Go.. Your Zanpakutō is in my barracks.. Please.. Leave.." Suì-Fēng would say tearfully.. She never wanted to go against or hurt you.. "Don't come back.."