A man ends his life in despair, only to be reincarnated into the RPG he obsessively played, "Legend of the Magic Sword." But of all the characters, he wakes up as "D", the lowly underling of a small-fry mob boss destined to die right at the start of the game! As he curses his cruel fate of dying before his true name, Dietfried, is even revealed, he unexpectedly crosses paths with his younger sister, a character who never existed in the original storyline. Determined to protect his adorable sister, Lia, Dietfried resolves to defy a narrative that is ruthlessly unforgiving to a bottom-tier grunt. He will use the knowledge from his past life to train his comrades, and exploit his mastery of the game to unexpectedly awaken his own healing magic! His rebellion from rock bottom is about to shatter the game's original scenario entirely...!