My Yandere Succubus Daughter is Mommy-Warrior's Natural Enemy - Volume 7 Chapter 31

Have you ever thought that the state of the world as it presently is, could revert to the laws of the ancients? When a series of strange incidents beginning with the disappearance of his friend led Luo Yuan to question the possibility of an apocalypse, he becomes embroiled in the midst of a global-scale chaos.

Evolution has turned the flora and fauna of the vast and bountiful Earth into something that had never been seen before. Coincidentally, the all-dominating Homo sapiens have ended up at the bottom of the food chain. From mystery to crisis, will Luo Yuan discover a means of saving humanity by racing to the top of the food chain? Or will he strive in accordance with the law of the jungle? It is the dawn of an age of the survival of the fittest.

- Description from Novelupdates

In a world where power is marked by glowing runes and monsters bleed through the fabric of reality, **Ryu** is nothing—an orphan with no name, no status, and no hope. Beaten down by nobles who wield their divine-given strength like a whip, he survives on scraps and stubborn defiance.But when a black rift—an anomaly unlike any ever recorded—appears in the dead of night, Ryu faces a choice: die a beggar, or risk everything by stepping into the unknown.Inside, he finds a nightmare. Kolasis, a legendary predator, hunts him through a twisted forest. The rules here are simple: kill or be killed. To survive, Ryu must forge himself into something sharper than the claws of monsters and crueler than the nobles who cast him aside.Yet the rift has its own secrets. The same power that could make him a legend might also break him—if the monsters don’t tear him apart first.

The protagonist is an accidental time traveler - he didn't wait, didn't guess, only dreamed, but ended up in history, which he didn't pay much attention to. He was just lucky with his lineage.Ryo is a new member of the Nara clan, from the Uzumaki lineage on his father's side, and it so happened that he was born not at the beginning of the known plot, but more than three decades and two world wars later. Now he has to figure out how to get out of this situation however he can.

A story about a traveler who crossed into a parallel universe, relying on his Proficiency ability to continuously grind experience and become stronger.