Naruto System in One Piece - Chapter 100

Li Xiaofei, thrust 500 years into the future, finds himself as a young orphaned man in a harsh, post-apocalyptic world. Raised by a woman only slightly older than himself in the unforgiving slums, he quickly learns that survival requires both strength and cunning.In a world ravaged by alien star beasts, where gangs rule the streets and political factions vie for control, chaos is the order of the day. Amidst this turmoil, Li Xiaofei must carve out his own destiny. Armed with the mysterious Moonlight Treasure Box, he embarks on a perilous journey to make a name for himself and protect the ones he loves.Will Li Xiaofei rise above the chaos to bring peace to his world, or will he be consumed by the darkness that surrounds him?Official BlurbThe star beasts invaded, and Earth’s civilization collapsed. A young man, wielding the artifact Moonlight Treasure Box, drew upon the legacy of three thousand martial arts techniques from various worlds. He protected humanity, won the hearts of beautiful women, slew star beasts, suppressed myriad races, ruled the universe, and commanded the heavens. In the vast cosmos, he was invincible!

…but it seems pretty doable.

[sweet, pampering][strong FL, 1v1]He was an absolute noble, decisive and cold-hearted, yet he was persistently entwined with her, doting incessantly.The first time they met, he questioned, “Six years ago, was it you?”The second time they met, he was holding a paternity test, “You still dare to say your son isn't mine?”The nth time they met, she finally lost her patience, “Sir, will you ever give it a rest?”The man lifted the corners of his mouth, smiling with a deep and enchanting charm, “Not before our second child is born.”

Damian's life is bland, miserable and getting worse. After hitting rock bottom, he travel to another world. In an alternate Albion, he faces dangers and delights beyond anything he could have dreamed. The new and powerful sorcerer soon realises it will be a struggle to survive.