Toaru Majutsu no Index: New Testament - Volume 14, Chapter 4: Kamijou Touma and Kamisato Kakeru - Attack_the_Fist.

Sein was only a child when he was abducted from the surface world and forced to join the Black Magic Academy. In the Underworld, strength reigns supreme and the weak struggles to survive. As the death toll of magic initiates continues to rise within the walls of the academy, Sein’s quest for knowledge and power is a constant battle for survival.

Memories of his parents and the starry night sky in the surface world are fading with each passing day in the Underworld.

“Is Magus World the name of the world we live in? Where is my home in the Magus World?” These are the burning questions that Sein has in mind.

Will he be able to rise to the pinnacle of power, discover the truth of the world and ultimately find his way back home?

Official blurb:

He hails from the banished land of the Underworld, bound by a single unforgiving rule—survival of the fittest. He is the seeker of truth, a mage who treads the fine line between sanity and madness. In a world where myths have crumbled and chaos holds sway, it is strength that reigns supreme.

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“WTF????? WHY DID I GET REINCARNATED INTO ASH “WORTHLESS” VOIDVEIL'S BODY?!?!”As soon as he opened his eyes again, Ash realized that he had been reincarnated into a character from the extremely difficult game he streamed.And what's worse, the character he reincarnated into was The Useless Prince. A broken character, not because he was too strong, but because he was too weak.The Useless Prince was the most trashy character in the game, both in terms of personality and power.But what else could he do? Ash was currently The Useless Prince, and he couldn't change that fact.So what was his goal?It was simple, he had to survive and return. And to do so, he must go through the False Horizon to reach the Abyssal Realm, defeat the game's boss, and return.But don't forget, even though Ash was the first person to clear this game, it's still incredibly difficult.Will he be able to return to his world?“To be honest, I don't know either.”

Pei Qin, upon transmigration, was instantaneously drenched in a basin of misery.The Scholar father was murdered on his way to the exams, and eldest uncle Jian Shen had two households.There was a son from the second wife, but neither grandparents nor villagers liked him, and he was also a thorn in the side of eldest aunt.Valuing sons over daughters, they wanted to sell her to buy land.Malnourished and poorly clad, her mother and siblings toiled like beasts of burden.Before she could strive for a better life, that already deceased Scholar father came back to life.He'd married a rich man's daughter? Sired two sons?Life was so hard, yet it drove his wife to her death.Pei Qin looked at her emaciated younger siblings, her hands trembling: To the mountains!!————————Lived in caves, built a hut, ate wild vegetables, gathered wild fruits.In poverty-stricken days, Pei Qin led her siblings to quietly amass wealth and silently prosper.Just as they were about to thrive, another wave of misfortune was thrown their way!Pei Qin with hands on hips: If you want to play the scoundrel, I'll make sure you're reduced to nothing!********************

Cheng Yin likes her deskmate Chen Yan for a long time, but she never dared to confess her love for him, and the phrase ‘I like you’ is a secret hidden in her heart, but she can’t help but blurt it out from time to time…
Cheng Yin: “Chen Yan, I’ll whisper something to you.”
Chen Yan always leans over quite cooperatively, “What?”
The words came to her lips, Cheng Yin blushed and changed it into: “Your pants are unzipped.”
Chen Yan: “?”
Later, this kind of useless whispering has become more frequent, and Chen Yan listened again without moving a bit: ” Speak.”
The day of the party, Cheng Yin drink for the first time, Chen Yan became two in front of her eyes, she grabbed the person with both hands, want to try to catch the real Chen Yan, only to have her hand caught, he lowered his head in her ear and said: ” Let me whisper to you.”
Cheng Yin: “…… what?”
Such bad behavior, she thought it was something bad, Cheng Yin checked her pants and made sure the zipper was closed before she lean over.
The man’s breath blew softly in her ear, laced with a bit of the smell of wine.
“I like you.”

- Description from Novelupdates