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. 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.]---- High School DxD - Main World! 1 - High School of the Dead [●] - First - World Traveled 2 - Demon Slayer [●] - Second - World Traveled 3 - Akame Ga Kill [●] - Third - World Traveled 4 - Bladedance of Elementalers [●] - Fourth - World Traveled 5 - ??? Accelerated Growth Character Growth Charming Protagonist Cunning Protagonist Handsome Male Lead Harem-seeking Protagonist Magic Overpowered Protagonist Reincarnated into Another World System Administrator Weak to Strong