Claimed by the Prince of Darkness - Chapter 57: When Porcelain Breaks

Shao Xuan joins a friend in his expedition to a recently discovered archaeological cave. After he picks up an ordinary looking stone he is teleported to a different world and wakes up in the body of a small orphan child. The world he is in now is still in its stone age with primitive tools made of stone and the ways of the people are savage. Savage isn’t the only thing special about the people though, because they have superhuman strength, jump higher than trees and punch stones. In short, they are able to cultivate their bodies. Despite all this, it is a real struggle to survive because of the scarcity of food. Together with Caesar, his pet wolf, he tries to survive in this cruel world.

- Description from novelupdates

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

A supreme expert in the Immortal World had died, and a strand of his soul returned to its original body on Earth. Tang Xiu discovered with amazement that ten thousand years passed in the Immortal World, yet only a single year passed on Earth.

Wang Guorui traveled to Taiwan in 1895, and obtained a super gold finger—the Red Police Base.

Since then, the whole world has been changed.

The Emperor of Japan: “He must be eliminated, otherwise our great Japan will never have peace!”

The Russian Tsar: “Please stop fighting. I will marry my daughter to you and cede Siberia as a dowry.”

British Prime Minister: “Why did I wake up and the navy of the British Empire is no longer the number one in the world?”

German Emperor: “Dear and brave German soldiers, please persevere, our Eastern allies are coming soon!”

- Description from novelbuddy