Toaru Majutsu no Index: New Testament - Volume 15, Chapter 2: Peace, or a Trap Laid — Board_Game.

The main character Lei Yu does not have the ability to practice his family’s martial arts. He gets stepped on and tossed around. Due to certain reasons, he leaves the family, coincidentally gains an ability, and makes his own path to becoming an immortal.

- Description from Novelupdates

Fate had never been kind to Ji Ning. Wracked by illnesses and infirm his entire life on Earth, Ji Ning knew early on that he would die as a teenager. What he didn’t know was that there really was such a thing as life after death and that the multiverse was a far larger place than he thought.

A lucky twist of fate meant that Ji Ning was reborn into a world of Immortals and monsters, of Ki Refiners and powerful Fiendgods, a world where Dynasties lasted for millions of years. A world which is both greater… and yet also smaller… than he ever could imagine. He would have the opportunity to join them, and in this life, Ji Ning swore to himself, he would never let himself be weak again! The Era he was born into was a Desolate one, but Ji Ning would make it his era.

Brutality is my style of conduct! If you can't accept that, I'm ready to fight—that's who I am!Don't mess with me, otherwise, I won't mind teaching you the meaning of “The Return of the King”!!!

At twenty-four, Ashley Flynn had endured more than most. From the tragic loss of her parents to the lose of her marriage–and now, the mysterious abduction of her daughter. Just when she thought life couldn’t get any crueler, her ex-boyfriend resurfaced. Rich, powerful, and more relentless than ever, Lorenzo Grey was determined to win back Ashley’s heart, no matter how much she hated him. Or how long it took him.When she turned to him for help finding her missing daughter, he saw the perfect opportunity he had long awaited.“You mentioned that you wanted to help me find my daughter,” Ashley said, her voice trembling slightly.“Yes, I did...” Lorenzo replied, watching her like a hawk. “...but it won't come without a price.”Ashley hated him even more for trying to exploit her desperation–but he knew this was the only tool he had left to reclaim what was once his. And now, Ashley must do what she felt was necessary, even if it meant breaking her own defenses and craving the very man who once shattered her heart. Because to her, a mother’s love knows no limits—and no sacrifice was too great.