Aaron, a seeker in the labyrinth known as the 'Divine Corpse Maze,' found his progress halted after learning only the basic sword skill, [Slash]. Having reached the absolute limit of his skill growth, he was ruthlessly exiled from his adventuring party. Despite this, Aaron couldn't abandon his dream. He chose to continue his journey as a solo adventurer, wielding nothing but that solitary [Slash] skill. Everyone mocked his inefficiency and recklessness—yet, ten years after his exile, he was on the verge of reaching the realm of the strongest swordsman through [Slash] alone! Eventually, a mysterious hero known as the 'Extreme Blade' (Kyokuken) suppressed a Great Disaster within the labyrinth with a single sword. Without a single clue that he is the very hero everyone is searching for, Aaron draws his blade once again today—! A labyrinth sword fantasy featuring an obliviously overpowered protagonist begins here!!