In Different World with Naruto System (WN) - Chapter 22 Nature of Expert

The Cloud Continent, respected for martial arts, the great world descends and the geniuses gather.

This era is a stage for the wicked.

Han Yu, who is a demon from the sky that swallows the body, rose after three years of silence, and since then he embarked on the path to hegemony by trampling and killing all kinds of evil spirits.

In front of Han Yu, nobody dared to call him against the sky, because the world can be swallowed, much less against the sky.

Ajax was an orphan who survives a massacre along with his friends but unfortunately gets separated from them.

Fortunately, after a turn of events, he successfully gains a system which helps him increase his cultivation, but doesn't know what it is called.

But he knows one thing for sure, this system is very powerful and helpful in taking his revenge.

“Whoever you are, I am gonna find you”, Ajax mumbled himself with a disgruntled expression.

In a world where Summoning of an elemental spirit is done through a dream when they are 15 years old, Ajax with the help of a system and his summoned spirits sets out on a journey to seek revenge against the mastermind behind the massacre.

I met the male lead in prison.

A serious accident caused the protagonist’s brain to have an unusual mutation. This changed the brain development that it opened the door to a mysterious universe. Not only he obtained a ‘god-like’ powerful telekinetic control and mental perception, he also had an abnormal analysis and memory capability comparable to super computer. Having such super brain, his rough life began.

Brain development progress 10%…….20%……50%….80%…. …100%

- Description from Novelupdates