I Kept Pressing the 100-Million-Year Button and Came Out on Top, Vol. 1 (light novel) by Syuichi Tsukishima
Allen is training to be a swordsman, but he's just no good at it. After losing a duel with
high stakes, he's about to drop out when a mysterious man offers him a chance to get
100 million years' worth of training with the press of a button. But what happens when
he presses it over and over?!
high stakes, he's about to drop out when a mysterious man offers him a chance to get
100 million years' worth of training with the press of a button. But what happens when
he presses it over and over?!