After dying under mysterious circumstances, she is reincarnated into her favorite otome game as the daughter of a count. Unfortunately, she isn't the heroine. She's merely an NPC destined to die. Determined to escape her fate, she soon discovers an even more terrible truth: she suffers from a rare disease, and the only person capable of saving her is the game's heroine, a girl blessed with the power of Light. But there's a problem. The heroine hasn't learned to control her powers yet. And if she waits too long, her disease will kill her. To make matters worse, someone is already destined to murder her according to the game's original storyline. She has no choice but to enroll in the Magic Academy, where the heroine is destined to appear. Find the heroine. Help her master her powers. Catch the person who is supposed to kill her. And above all... Survive the story she already knows. After all, knowing the game is one thing. Changing its ending is another.