Heavy Metal - Chapter 68 – Familiars

In the rebirth, in order to prevent the tragedy of the previous life from happening, Bai Yu decided to rush to the [Tower of God] at any cost, and face everything together with his sister!

However, Bai Yu, who was bound by the system, mutated his bloodline, and transformed into a black-scaled python seems to be developing on a completely different path from his previous life…

- Description from novelbuddy

Zhang Yang, the office drone, spent his days slacking off with the campus beauty and his nights watching his sister-in-law practice leg lifts. His girlfriend Xiao Man watched him every day, falling deep in thought... Until one day, while straddling Zhang Yang, she unleashed a soul-searching interrogation, “Why did the dean bow to you? Why did the richest man gift you a villa? Why did the tattoo-covered big brother kneel before you, begging you to take his wife?”

Evolution, it is the process with which the most fit for survival pass down their winning traits. What if this could be done on one animal, one object, one person, what traits would evolve.

...

Humanity has been entered into the grand inter-realm competition for sovereignty of all realms.

Darwin has been granted the gift of evolution

After dying in the world of One Piece, he was reincarnated once again this time as Neji Hyuga. But fate was no kinder here. With his father dead and the cursed Caged Bird Seal looming over him, for his survival he made a ruthless decision....