Toaru Majutsu no Index: New Testament - Volume 4, Sub.15

Jaden Cross is a young man trying to survive in the shadows of Neo-Lagos, a futuristic city where the poor live in broken homes and forgotten slums. Orphaned at six and forced to grow up fast, Jaden spends his days fixing scraps and dreaming of a better world—a world he believes he’ll never see.Until one night, everything changes.A mysterious glowing orb appears in the sky and connects with Jaden’s mind, activating the Tech Architect System—a powerful, sci-fi interface that gives him access to futuristic blueprints, instant-building tools, and system quests that reward him for solving real-world problems.His first quest? Restore power to his neighborhood using solar microgrids.Soon, Jaden is building cooling shelters, clean energy systems, and AI-run apartments—one project at a time. But with each success, he draws more attention. The city’s leaders want to control him. A rival from the tech underworld wants to steal the system. And darker forces are watching from the skies, waiting for the Architect to grow.Armed with only his mind, his hands, and the Tech Architect System, Jaden must rise from the ruins of poverty and become the builder of a new future.But in a city full of secrets, will he remain its hero… or become its biggest threat?

Year 2056, in a city in the Yuan Jiang Su Jin area. On top of a ruined, shattered six story residential apartment sits a teenager wearing a combat vest, militaristic trousers, and alloyed battle boots. On his back is a hexagonal shield and equipped is a blood-shadow battle knife. He sits there silently on the edge of the roof. At this time, the sparkling sky was shining and there was a refreshing breath within the air that blew towards him. However, there was only silence within the ruined, deserted city, with an occasional howl that makes your heart skip a beat.

The simulation is over, and the entry is obtained: a showdown!

Looking at this entry, Zhao Meng was stunned.

“How should this term be used?”

“Hey! Here’s a wounded fox!”

…

A few years later, a woman who looked like a fairy appeared in front of him, and said:

“My lord, I’m here to repay my favor!”

This book is also called “Starting from Transforming Monsters”

- Description from novelbuddy

She killed his wife, destroyed his reputation, and ran off with his son. 8 years later, she returned home with her genius son, who already had a fiancée. “Give me the child, or you can’t afford the price.”“A girl who eats meat and vegetables doesn’t suffer, if you want a child, find yourself a woman to give you one.”