DxD: Scion of Lucifuge

Transmigrated into the world of High School DxD, Roy believed he had been handed a life of luxury and glory. Born into the prestigious Lucifuge family, with his sister Grayfia as his strict yet devoted older sister, he thought he was destined for greatness.

99,997… 99,998… 99,999… 100,000!!

But... reality proved harsher: Roy lacked demonic talent and, despite years of training, remained a Low-Class Devil. While his peers effortlessly achieve High-Class status, he’s been trapped in a cycle of endless sword practice and ridicule. Yet, he refused to accept mediocrity. Ten thousand sword swings a day, relentless training.. Until one day.. [Ding! The Strongest Demon King System has been activated. Access functions to learn more.]

Follow Roy as he transcends his limits, traveling across multiple worlds—from the undead-infested halls of High School of the Dead to the dangerous landscapes of Demon Slayer, Akame Ga Kill, and beyond—to forge his own path to absolute power.