I Hit the Button for a Hundred Million Years and, Before I Knew It, I Was the Strongest, Ichioku-Nen Button O Renda Shita Ore Wa, Kizuitara Saikyou Ni Natteita, 億年ボタンを連打した俺は、気付いたら最強になっていた ～落第 Allen is a boy who is despised as a failed swordsman. One day, desperate for a duel with an elite swordsman who bets on leaving Kenjutsu Academy, a mysterious hermit asks him if he will press the “100 million year button”. Can the mysterious object really help him train for 100 million years?