Grand Ancestral Bloodlines - Chapter 21: Inner Devil (2)

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 anime otaku who has traveled to the world of full-time hunters, in order to live well, he can only keep getting stronger all the time, burying the strong one after another. Your withered life will be continued by me.

- Description from novelbuddy

Starting from Hunter, Becoming a God at Level 100At level one, each attribute point increases by 1; at level two, each attribute point increases by 2; at level three, by 4…and at level ten, by 512.With every level, all attributes double. But at level 100, will he still be human?Lorraine wakes up to find himself transported into the world of Hunter x Hunter.Good news: he’s crossed over!Bad news: it’s a complete immersion.Good news: he has a system!Bad news: leveling up requires physical training.Good news: the system is powerful! Each level doubles his attributes, and at level 100, he’s granted godhood!Bad news: with each level, the experience needed also doubles.Thus, in the boundless worlds of existence, Lorraine embarks on his endless path to ascension.

The world that nurtured the civilization which reached the pinnacle of magic was on the verge of destruction.
The last survivor transmigrated to the past, when the magic civilization started growing, as countless mages were still fumbling their ways through the thorny paths of magic knowledge.
He, who came from the end of the magic era, aim to reach the pinnacle of magic.

- Description from Novelupdates