Naruto: Manipulation - Chapter 156: As Expected of Jiraiya-sensei…

This world is Heaven.

Because this world has everything you dream of, everything you wish for.

This world is Hell.

Because everyone in this world are parts of a never-ending massacre.

Are you fighting to survive, or fighting to come home?

- Description from Novelupdates

Eric Langley, an eighteen-year-old boy whose parents passed away three years ago, had no known relatives and was left to fend for himself. To support himself, he worked in a bakery, using his earnings to cover his daily needs and indulge in his favorite pastime—reading chapters of the novel “Humanity's Strongest Mage,” which had recently gone on hiatus.Eric had a love-hate relationship with the novel. While he was captivated by its world, he despised the Protagonist, Alex Whiteheart. Alex had it all from the start: strength, fame, money, and of course, a harem. He never faced any real challenges, effortlessly overcoming every obstacle, which made the story lack something Eric craved....... Chaos.One evening, while taking a walk with his headphones on, Eric was lost in thought. The music drowned out the world around him, and he failed to notice a car losing control and speeding toward him. The last thing he heard was a screech before everything went dark.When Eric woke up, memories flooded his mind, and he quickly realized something was wrong. He wasn't in his own world anymore; he had somehow ended up in the world of “Humanity's Strongest Mage.” To his shock, he found himself in the body of Arin Vale, an insignificant character never mentioned in the novel—a true extra.Now, armed with the knowledge of future events and driven by a desire for chaos, Arin had one goal: to disrupt the smooth journey of Alex Whiteheart, the Protagonist. He was determined to introduce Chaos into the story, making it far more interesting than it ever was, and in the process, he'll also find out that there's more to his character than just being an Extra.Let the Chaos begin!

The world has changed into something like a game.

It resembles a survival virtual reality game where people were attacked by zombies and monsters.

And I was the last user of that game.

Before going to college, an ordinary high school student went to celebrate and got drunk. When he woke up, he found himself in a completely different world. There was a big sect, the approaching sect entrance examination, a slum where his body’s previous owner lived, and a shared memory about a missing young girl.

When he got tangled in a fight with a few punks in this different world, he fell off a cliff and miraculously found himself still alive, with two more voices ringing inside his head. They were Sword Master and Saber Master. In the company of them, he continued to find out more about this whole new world. He took the sect entrance examination, entered the sect, met a strange man in black, and even participated in a major competition of the sect to have a chance to win over his peers!
In this whole new world, he was born again and got to explore the fantastic martial world!

- Description from Novelupdates