Immortal Devil Transformation - Book 12: Chapter 53: A Chess Piece in That Woman's Hand

Xia Yan passed through to the world of Bleach and became an eleven-year-old boy. He was rescued by Renji and Rukia in the Seireitei, and he was studying at Shin’ō Academy, and he was a student of the same class.
He is a top student of the Shin’ō Academy, and he is vying for strength by various teams. In the end, he has entered the first team of secret mobile maneuvers.
He will use punishment to kill every person who tries to threaten the martyrdom and protect his loved one.

- Description from Novelupdates

“They said the world would fall without me.”“They said I was the strongest.”“Then they buried me with honors... and a blade behind my back.”Remiel St. Clair, humanity’s strongest exalt, prince of a once glorious empire, was betrayed and buried.Nine centuries later, he awakens in the body of Lucien Callastre, the second prince of a kingdom descended from his own treacherous bloodline.Stripped of powers, but not of pride, he must rebuild his lost strength and rise to power yet again to fend off the ever-growing threats of the spirits.The maw is growing.The spirits are returning.But so is he.And this time, the Exalted Prince is not dying quietly.