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?! (Source: Yen Press)

Ichioku-nen Button wo Renda shita Ore wa, Kizuitara Saikyou ni Natteita: Rakudai Kenshi no Gakuin Musou began as a web novel on Shousetsuka ni Narou on February 1, 2019. Kadokawa has released a revised and illustrated version of the series since October 19, 2019 under its Fujimi Fantasia Bunko label. The series has been published in English as I Kept Pressing the 100-Million-Year Button and Came Out on Top: The Unbeatable Reject Swordsman by Yen Press under the Yen On imprint since November 9, 2021.