High School DxD - Volume 23 Chapter 3-2

With the revival of spiritual energy and the breakdown of the order of species, it is a difficult test whether human beings can still stand at the top of the biological chain.

(There is already an old book, The Strongest Descends in the City, you can read it.)

- Description from novelbuddy

Human civilization expanded into space, and its territory spanned across galaxies.

During this great trend of interstellar migration, Zhou Qing accidentally awakened the power of traveling to various Astral Realms. He was able to create [Astral Realm Apostles] as vessels for his soul and project them onto different realms. This allowed him to travel through various worlds with different identities.

His unremarkable life was met with an unexpected twist of fate. Every time he created a new Apostle, it was like being reborn.

Yet, slowly, he realized that the Human civilization wasn’t completely ignorant about the existence of other realms…

——

Multiple-dimensional worlds, multi-dimensional factions. This is an clash of fate between realms!

And he is the only being who is able to travel amongst the realms in countless different shapes and forms — The Astral Apostle!

The journey to the martial peak is a lonely, solitary and long one. In the face of adversity, you must survive and remain unyielding. Only then can you break through and continue on your journey to become the strongest. Sky Tower tests its disciples in the harshest ways to prepare them for this journey. One day the lowly sweeper Kai Yang managed to obtain a black book, setting him on the road to the peak of the martials world.