Reina had always lived a life centered around her younger sister, Mana. When she finally thought she would be freed from Mana upon entering a new school, she was suddenly transported into the world of a game. And there, shockingly, Mana had been summoned as the “Saint”! It turned out that Mana had dragged Reina into this other world just to dump all the chores onto her. Determined to break free from a life revolving around her sister, Reina offers her cooperation to Chancellor Edvald. While studying diligently under him and making use of the knowledge she brought from her original world, the way people view her begins to change—!? A tale of an unfortunate older sister seizing happiness in a dramatic reversal of fate.