Phoenix Reborn In One Piece - Chapter 304: Akainu’s Ruthlessness!

Xia Yan passed through to the world of Bleach and became an eleven-year-old boy. He was rescued by Renji and Rukia in the Seireitei, and he was studying at Shin’ō Academy, and he was a student of the same class.
He is a top student of the Shin’ō Academy, and he is vying for strength by various teams. In the end, he has entered the first team of secret mobile maneuvers.
He will use punishment to kill every person who tries to threaten the martyrdom and protect his loved one.

- Description from Novelupdates

I became the villain in the story of a hero.

So I was about to quit after fighting the main character.

But she’s obsessed with me. Why…?

Nicholas Marjan, known as Niels, was an Asian football-obsessed loner in the modern world. A master of FIFA Career Mode, addicted to YouTube tactics videos, and followed every twist of the transfer window like it was life or death, he lived the beautiful game from behind a screen.Until the day he died.And woke up in the late 2000s, in the body of a once-promising young player at a lower-league English club. A player whose career had been cut short by a brutal ACL injury. With his playing career over before it could truly begin, his second life offers no glory on the pitch.But Niels still has one weapon: his mind.Armed with future knowledge of football's evolution, and guided by a mysterious, almost cheat-like instinct for scouting raw talent, Niels steps into the world of coaching. As an assistant at a struggling lower-league club, he begins to reshape the team from within challenging outdated tactics, unearthing hidden gems, and reigniting hope in the dressing room.His methods are unorthodox. His instincts, uncanny. And soon, whispers about the “young coach with a gift” begin to spread.This isn’t the story of a player chasing glory. It’s about someone reborn to change the game from the sidelines. From forgotten training grounds to Europe’s biggest stages, Niels is on a mission,not just to win, but to rewrite what it means to lead.He once dreamed of lifting trophies as a player.Now, he'll do it as a coach.

There are always four kinds of people in the traditional Mary Sue world. The Male Lead, the Mary Sue female lead, the woman who never wanted to see the female protagonist live a good life, and the infatuated man willing to destroy heaven and earth to get the female lead.