Rebirth in One Piece as Deputy Captain - Chapter 506

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

- Description from Novelupdates

Cifer was offered as a sacrifice to the devil by his own family. Instead of dying, was given a chance to live in another world. The One True God has given him a mission. Stop the higher being calling themselves gods from snatching soul from the life stream and restore balance.An adventure will begin from a devil's sacrifice to be one of the most powerful beings seen.With a body of a titan and souls of devils, grasp power and devour everything for happiness and freedom.

She always knew there was a woman hidden in his heart, so when that woman appeared, she obediently withdrew. However, unexpectedly, he abandoned his 'beloved' and instead frequently invited her.“Mr. Fu, didn't you say there was a contract to discuss?” He pressed her against the cold wall, continuously approaching: “If you were a bit uglier, perhaps I would want to talk contracts and drink tea with you, but you're so beautiful, I only want to talk love with you.”To him, Qiao Mo was like his most cherished treasure, and whenever others looked at her, he felt they were trying to steal her.

She had a dream: the world was brimming with light. Family. School. Friends. Trains. Buses. Movies. Books. In that world of light, she grew into adulthood… and at the very end, in a white room, she fell into darkness. She awoke from the dream to find that she had become a demon. In the demon world, she lived a carefree life until she encountered a powerful being.