The Black Beast’s Useless Concubine - Chapter 897 - : Little Spirit’s Secret!

This is the story of a modern sailor who was accidentally reborn as a soldier of the Brazilian Expeditionary Force, and finally became the largest plutocratic family in Brazil by virtue of his foresight.

- Description from novelbuddy

A replica of Marquis Kieran Vale, the son of the Marchioness of Vale, who she deemed a failure. That was all she was. No, she was now referred to as “he.” At least until she met Claude Del Ihar.

The Hero Age— circa 3113 ad. An age where humans have developed superpowers such as superspeed, superstrength, and every cliche superhero power there is. But not everyone awakened superhero powers.

A tad 1% of the population were unawakened and Satoshi is one of them... or so he thought.

It all started when he wished for a System-like ability in front of a retro computer, which in turn granted it the power of the System. What Satoshi didn't know is that he holds the power to transform/evolve animals and inanimate objects.

How will Satoshi's life evolve after this newfound power? Will he finally be the very best like no one ever was?

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