Toaru Majutsu no Index - Volume 4, Prologue: Parallel World in Real World.

A teenager finds himself in the Marvel World with the Dragon Balls, and has to find a way to survive!

Shenron: “Say your wish! Any wish can be granted, but you only get one…”

Teenager: “Any wish could be granted?”

Shenron: “Of course!”

“Great!”

Teenager: “Shenron, please get me out of the Marvel World; return me to my original world!”

Shenron: “I’m sorry, I can’t do that…”

“….”

Teenager: “What? What were you bragging about then, saying you can grant any wish?”

Shenron: “Your body is from this world, therefore….”

“….”

Teenager: “Okay, then give me the power of a Super Saiyan! I want be able to beat Thor and Hulk, surpass Captain America and Iron Man!”

Shenron: “I’m sorry, I can’t do that…”

Teenager: “Worthless dragon! What can you do?”

Shenron: “I can…”

- Description from Novelupdates

There was no warning and it took them by surprise when the meteorite hit the earth. They thought they were doomed, but they managed to survive the apocalypse. They lost billions of lives because of that incident, and it took them decades to be able to stand on their own feet, but when they thought that they were fine, they were wrong. They found out that the meteorite brought something with it, they discovered a species and they called them Extrateressterial Parasite. It devoured and consumed anything that was alive, and they realized that the apocalypse was just the beginning of their suffering.

After centuries of trying to survive, Archie Lancaster the one who believed the end of humankind could be changed decided to do his best and tried to become one of those people that prevented humankind from extinction. His path wasn't easy nor peaceful, nothing could be described what kind of experiences he had been through.

Sword God, Ahn Suho.The greatest swordsman player in humanity was, surprisingly enough, a civil servant hunter belonging to the Korean Hunter Association.Suho chose the path of a public servant purely to end the gates.Perhaps that’s why?When one of the disaster-level gates, called the final gate, was attacked,In an ironic turn of events, he was betrayed by his comrades.“You should have joined us from the beginning. Now I know why people say that civil servants are so inflexible.”The reason his comrades betrayed him?Because if the gates were closed, their power would disappear.Is this the end?Just as Suho’s consciousness was fading away,[Rebooting Player Ahn Suho’s system.]The system gave Suho one more chance.A chance to go back to the past and set everything right.

Zhuo Yifan was the Demon Emperor. One day, he managed to lay his hands on an ancient emperor’s book, the Nine Serenities Secret Records. As the book was coveted by many, he was targeted by experts and was even betrayed by his student.