Kuma Kuma Kuma Bear - Chapter 537 - Bear-san, Explains.

A frail and often ill son of a wealthy merchant unexpectedly embarked on the path of cultivating immortality while seeking a way to prolong his life!During the Tang Dynasty’s Golden Age, the world was at peace, the climate was favorable, and the people lived in tranquility.One thousand years later, demonic beings devoured the sky, demonic ghosts rampaged, and sorrow-filled cries resonated everywhere.The Journey to the West reappeared, the Great Sage fought against the heavens, the Heavenly Stem descended to the mortal world, reincarnating anew.Mysterious transmigrations and reincarnations, reality and illusions intermingling, truly extraordinary!Is it just a dream predicted in the prophecy? Or a reality that has yet to occur?Can he eradicate the predestined demonic barrier, eliminate the catastrophes of the Three Realms that have yet to occur, and save the people from utter destruction?

Luo Wencheng made a deal with a certain existence and went back in time to ten years ago, when he had just been released from prison, still young and healthy, not yet pushed to the breaking point by Luo Wenjun and not yet used by him as a prop to test drugs for profit until his tragic death.

This time he was going to trample Luo Wenjun underfoot.

The first priority was to steal Luo Wenjun’s future backer from him.

- Description from Novelupdates

Based on the popular Vocaloid song .

Rin, a young angel (presumed female, but angels don’t have clear genders) falls in love with a young human girl, Miku. However, their love is considered taboo, and so, Rin makes a deal with the devil to be reborn as the human boy, Len, in order to be with Miku. However, their happiness together is short-lived, and even that soon ends in tragedy.

I spent my life playing a game.
I hit the wall, stuck in second place for the rest of my life.

Out of the blue, I received a message and was possessed by the game.
As the worthless son of an Underworld Boss!

“Yes, bloodline is also a power, as long as you can use it. My ability is ‘Famiglia’.”

The game addict never disappears. Overwhelming violence, endless wealth, connections in the other world. I, I’ll use anything to stay alive!