Akame ga Kill: Starting with Dual Kamui - Chapter 35: Naturally Oblivious, Naturally Dark

Waking up in the body of a 6-year-old boy a few years before Cintra is destroyed, Madara receives a system that gives him the ability to gain the powers of Uchiha Madara.[The peak of Uchiha Madara's system is before he becomes the ten-tails jinchuuriki.]The system's percentage does not stop Madara's power, but rather the system's release. After all, I don't want to see a character who goes around killing everyone from the beginning of the story.

The Cambrian Explosion, now the largest life science puzzle…

500 million years ago,among single-celled life on Earth , there suddenly began mutations similar to evolution, a variety of gorgeous creatures were born “out of thin air”, all ancestors of today’s species appeared in that short period of time, each species were evolving at lightning speed; billion times faster than today, it was a brilliant era.

Unfortunately, the life of brilliant things are always short, after the brief “Cambrian”, life on Earth entered another 56 million years of evolutionary era at turtle speed. And humans, were also one step faster during the turtle race, and become the leader of life on Earth.

But now — a greater “second age” has come again.

During the lightning speed of evolution, humanity was kicked off of the throne on the food chain in the shortest time possible, and life on Earth, welcomed the second brilliant big bang.

The real end of the world, is no longer brainless zombies or desolate earth, but — the end of mankind, the whole earth’s paradise.

- Description from Novelupdates

In the blood-soaked world of Magus , Aizen, a young man from Earth, finds himself thrust into a brutal reality where Sorcery reigns supreme. Once a lowly servant, despised and humiliated, Aizen hid his true intentions beneath a mask of submission. With each insult endured and every drop of blood spilled, he sharpened his resolve, guided by the mysterious Wisdom System.