MTL - Unlimited Cycles of Death - Chapter 127 Silent classroom 16┃ is not in the real world.

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

Accompanied by all kinds of crisis and despair, was the arrival of mankind’s first significant superhero.

After getting hit by a car, Nolan thought death would bring him peace. But instead of resting in heaven, he wakes up in a world of gods and power.Reincarnated in the Academy of Heavenly Descendants, Nolan now finds himself surrounded by the heirs of mythological deities—each wielding divine power beyond imagination.But there's a problem: the body he reincarnated into is cursed.Without the ability to cultivate Divine Essence, Nolan is labeled as worthless, an outcast in a world where strength means everything.Just as he’s about to lose hope, a voice echoes in his mind:[Congratulations, Host Has Awakened The God King System!][Initial Bloodline Scan Beginning...][Scan Completed][Host Has Awakened the Power of Kratos, the God of Strength and War!]Equipped with a system that enables him to contract thousands of various mythological bloodlines, Nolan journeys across the limitless planes of existence, searching for the absolute power to achieve his ultimate goal—freedom!A path many have embarked on, but none have succeeded.

“From today onwards, you will become the Envoy of one of the Main Gods in the Dimensions of Gods. You will travel from one world to another and through that, you will attain what others will never obtain in their entire life.”