A failing swordsman in a swordsmanship academy encounters a mysterious old man who offers him a '100 Million Year Button.' Intrigued, the swordsman presses the button, instantly gaining immense power. However, he soon discovers the button's curse: each press traps him in a 'prison of time' for 100 million years. After countless loops of training and forgetting, he returns each time with honed swordsmanship. He eventually realizes he can escape the time loop by cutting through the world itself. This is the story of a failing swordsman who clears his name and makes a name for himself in the world with his extreme swordsmanship.