Toaru Majutsu no Index: New Testament - Volume 17, Afterword

Violet skies, a world undergoing massive changes, a deficient moon, interlinking voids…
When the world experienced a cataclysmic event,the majority of living things ceased to exist. Although humanity survived by hiding in the last safe zones, humans had to face mutated dire beasts and colossal source beasts that could break through the space barrier and enter the earth at any second.
Luo Yunyang, a young man who grew up in those calamitous times, obtained an attribute regulator and set out to walk the path of supremacy!

- Description from novelupdates

Kaito Nakamura, a shy university nerd, thought he’d found love when the stunning Aiko chose him as her boyfriend. Their sweet, fluffy romance fills his lonely world with hope—until he discovers she’s cheating on him with multiple guys, reveling in the taboo thrill of betraying someone so innocent. Heartbroken and humiliated as explicit photos of her circulate online, Kaito’s tears are interrupted by a mysterious popup: the “Revenge NTR System Beta.” Promising retribution but with a chilling condition — he can’t break up with her.Contains Ntr, read at your own risk

Using the brain as an Axis to process large amounts of data, an Advance Computer was made that is faster, accurate and more efficient than Quantum Computers.The only downside was it consumed an infinite amount of energy within a short period of time and also make the human brain stop functioning after prolonged use.Nevertheless, when a looming threat of destruction encroached on Earth for the second time due to excessive Energy emitted by Beta Asteroid Core, humanity decided to use the Advance Computer to siphon away the excess Energy!And the fastest way to do that was to make a VR MMORPG Cabin that will allow billions of people to dive in and make use of the Energy.****Seth was born with a very low body constitution that made him almost a cripple due to his body getting stressed very fast from any extended physical activity.He escaped reality by gaming and when he met with an accident he stopped gaming. But when the ultimate game was out, Asteroid Online, Seth was asked to dive again.Sadly, he found an exact replica of his real-life body in the game. At first, he detested it, but on that first day, Seth was intrigued by the game and wished to explore more.To his utter shock, when he raised his Skills to Talent in the game, his real-life skill also improved.A series of other unexplainable events keep happening to him which steel his resolve to crack the game mystery.