MTL - The Quick Transmigrator of the Female Supporting Role Always Wants to Kill the Male Lead - Chapter 324 Robot Butler PK Ruthless Inventor (40)

Roy’s life was nothing special. The only thing commendable was the last few moments when he saved a mother and her child from a drunk driver.
…
It’s really an egg! Damn it, what kind of monster have I become? Did I fall into Hell instead of making it to Heaven??
Join Roy as he ventures through various worlds with the Custom Made Demon King System—a system that allows Roy to draw anything he can imagine and create it through exchanging souls!

A fighting genius.

After Wang Mang died, he turned into a giant python, evolving crazily!

With the help of his family, he is getting bigger and bigger!

From the first few meters, tens of meters, to hundreds of meters!

From the Burmese python, to the Titan python, to the deep sea python!

When Wang Mang’s size reached hundreds of meters, the earth’s catastrophe came…

- Description from novelbuddy

One day every human on the world suddenly receives a mail claiming to enact the World Salvation Project. Half in doubt Kurosaki Shion, a diligent university student and loner, follows the mail’s instructions, becoming one of a million Demon Kings governing his very own Domain in the new world.

*** This is a post-apocalyptic story containing many fantasy elements. It is a somewhat dark tale following Shion as he grows while aiming for the unification of the all too sudden new world. It has many game-elements bolstered by strategical thinking while at the same time providing funny moments and romantic encounters.