MTL - Year of Herbs - Chapter 631 he never changed

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

Have you ever read a story? So stupid and senseless that it makes your blood boil and makes you pity even the villain of the novel. if you haven't that's fine because our protagonist did.“FROM WHERE THE FUCK DID NTR COME FROM?”He threw his console controller on the which did a cartoonish bounce and formed a bump on his forehead.------“Wait! What's this place!?”The moment he woke he found himself in a strange location never been visited by him ever before.------“No!! No!! No!! How the hell did I end in the body of this cucked villain! Why did I end up in this body!!”He lamented when looked at his face in the mirror that got beaten blue by the protagonist of the game.------“Don't worry, Riech. I will fulfill your and fucking kill the bastard and fuck his mother and avenge you!”He clenched his fist and gritted his teeth in anger vowing to take revenge.

In the year 1257 of the Federation Calendar, Chen Pingchuan, who has crossed into a different world for three years, gets the Apocalyptic Wasteland Simulator.Through information obtained from the simulator, a sudden disaster will strike Spring City in a year. Accompanied by highly radioactive red rain, a type of mutated creature called Black Demon will be born.With the simulator, Chen is in a better position to survive, but he also wants to find out the secrets of the girl he meets in simulations.Simulator: [She left you a small bottle of liquid with an unknown effect and a note with just two short lines written on it.][Avoid the red rain!][Forget me!]

A series of short stories in the world of Toaru Majutsu no Index organized into chapters featuring Kanzaki Kaori as the protagonist, going around the world and space doing missions for the Church of Necessary Evil, however, there is more than meets the eye as each incident is connected.

One chapter was bundled with each limited edition release of the Toaru Kagaku no Railgun anime DVD and BDs, with all of them together being equivalent to a single normal Toaru Majutsu no Index volume