Hidden Marriage: A Heaven-sent Billionaire Husband - Chapter 2566 - : Twins

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

Yang Ming is an underachiever in high school. He skips class to shoot pool, cheats on his exams and gets into fights. However, by a twist and turn of fate and luck, he obtains some high-tech contact lenses that give him superpowers and dramatically change his life.

As his journey unfolds, he battles against society’s big guns and attempts to bring justice into an unjust world. Along the way, he has many interesting and romantic encounters with the ladies who are charmed by his character.

How will he use his superpowers?

Will he be able to overcome evil and bring justice to the world?

- Description from Novelupdates

Kai of the Sorcerer’s Tower is one of the last mages left, barely surviving in a world ruled by creatures of the dark — where the era of mages ended, and most of the lands got contaminated with dead mana. To save his world and fulfil his master’s last wish, he put himself through a forbidden ritual, risking his soul being ripped into pieces to make his way into the past. In an era with abundant mana — an era yet to enter the Golden Era of Magic. Things go wrong, of course, as they always do, and he finds himself thousands of years before the world fell to mana contamination — in the body of a young lord, Arzan. All is not well, though, as the young lord was murdered by someone right at the cusp of a beast wave threatening the territory, while larger threats loom on the horizon. There was a lot to do for Kai to regain his former strength in this time of primitive technology, but then again, he might just be able to change that.

Lin Xiao was an orphan who strived to get stronger while living with his sickly younger brother in an unnamed small village.