Naruto System in One Piece - Chapter 523

In this world, people are granted a power said to come from the heavens, a mighty weapon tied to the soul of humans. Those who receive these magical weapons fight against monsters to survive, driving the economy of this world.Lian is just an ordinary boy until his world is turned upside down when another race takes away what matters most to him: his family. From that moment, follow Lian's journey as he seeks the strength to avenge those who killed his family and uncovers the truth behind his power.

Sato Yu is a 12-year-old boy. He is a deprived person. His life is depriving. His step father has a large amount of debt.

Like many medical students, Li Yong just succeeds finding an intern job in hospital with great efforts and yet still is going broke. He even has no money to pay the rent. However, by coincidence, he acquires a magic power of clairvoyant vision and rich experience from 80 medical experts, all because of a pendant passed down from his parents. With the magic power, he can see through human’s skin and finds out any illness beneath without any physical touching or examination! Since then, his life has been tremendously changed. Love, fame and wealth become within reach for him…

- Description from Novelupdates

In 2030, humanity faced its first true collapse…not by war, but by the sudden invasion of Nightcrawlers, creatures emerging from darkness itself with the desire to devour sunlight at all cost for their evolution.But, they could not absorb it directly since it was as deadly to them as to a shadow under the noonday sun. They could only absorb the sunlight from lifeforms or through signing a nocturnal contract to possess their bodies, providing them with direct sunlight immunity.Within twelve hours, over four billion people perished as Earth was split between eternal night and day.Just as extinction loomed, Holy Light Pillars descended from the heavens, purging one thousand cities from Nightcrawlers and offering humanity sanctuary under their divine light.A century later, in the Heliodor Region, an innocent child found his world turned upside down after two mysterious nightcrawlers invaded his home, slaughtered his parents, and ripped his eyes out of their sockets, leaving him permanently connected to the Shadow Dimension, the home ground of Nightcrawlers.Was it just a random feeding session for them, a planned assassination, or it goes deeper than this?Follow Levi’s journey as he weaves between darkness and light, chasing the truth hidden in both.