Rei Arimura was a reclusive gaming addict, living a shut-in lifestyle. "There's no point in living like this anymore," he thought—until a sudden accident claimed his life! When he awoke, he found himself face-to-face with an unfamiliar old lady. She explained that Rei had been reincarnated into the world of the game he had played during his lifetime. He could return to his previous life and start anew if he successfully cleared the game. As a former world-ranking #1 player, Rei was confident and resolved to make the most of his second chance. However, upon reincarnating into the game, he found himself as the weakest mob character, with the lowest stats imaginable?! "—Fine by me! Mob or not, I'll clear this game no matter what!" Thus begins the comeback story of the strongest mob character, wielding the skills of a world-ranking champion, as he embarks on his revenge and aims for victory!