Ichioku-nen Button o Renda Shita Ore wa, Kizuitara Saikyou ni Natteita

Allen Lordle is widely despised by his peers and branded a failure at his sword arts academy. Facing relentless humiliation, he makes the drastic decision to leave the school, but not before challenging his classmate, Dodriel—a celebrated genius swordsman—to a final duel. Knowing he has no chance of winning through conventional means, Allen’s despair takes an unexpected turn when he stumbles upon a mysterious artifact known as the "100 Million Year Button." Though the button carries a terrible curse, trapping whoever presses it in an isolated world of time for one hundred million years, Allen uses this seemingly endless imprisonment to his advantage. By repeatedly pressing the button, he endures countless eons of solitary training, ultimately mastering the ultimate sword technique. When he returns to reality, only an instant has passed, yet his abilities have transcended all limits. Armed with his newfound strength, Allen completely overwhelms Dodriel in their duel and goes on to achieve extraordinary results at the prestigious swordsmanship competition. His remarkable performance even earns him a recommendation for admission into the elite Senha School of Swordsmanship. No longer the untalented outcast he once was, Allen now wields unmatched power, ready to make his name echo throughout the world.