MTL - The Queen’s Gigolo - Chapter 44

When we met for the first time in our first year of high school, he saw my contempt, but silently continued to clean;

In this post-apocalyptic world filled with beasts, humans must join together with their newly acquired classes to battle them. However, beasts aren't the only thing threatening the peace as class users similar to those around Kaden make moves in the shadows. Join Kaden in his adventure as a class user uncovering the dark secrets of those around him whether he wants to or not and paving his way through this treacherous world.

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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

An orphaned boy with dreams of making it big through being a blacksmith is given a once in a lifetime chance to succeed when he's taken in by an odd pair - Eggor and Ella. While former teaches him the arts of craft, the latter teaches him the mysticism of cultivation, granting him two paths to tread in this life.