Ichioku-Nen Button Wo Renda Shita Ore Wa Kizuitara Saikyo Ni Natteita – Rakudai Kenshi No Gakuin Muso Vol. 1 (Light Novel)

Allen is a boy who attends a swordsman academy and is mocked by those around him as being a failure. One day, he finds himself in a duel with classmate Dodriel, a genius swordsman, and there’s a huge wager on the line: the loser will be expelled from the academy! Feeling hopeless about his chances, he happens upon the opportunity to get 100 million years’ worth of training with just the press of a button. But instead of pressing it just once, he mashes it over and over! Now a master swordsman with over a billion years of training under his belt, he’s able to easily defeat Dodriel, and not only that, he’s also invited to join the prestigious Thousand Blade Academy! Now that he’s got the skills to be the best, this once failed swordsman is ready to make his name known around the world!
Notice: This book is written in Japanese.