Illya stops being the hero and becomes the one who has to choose who dies to save the world. The movie doesn't flinch from what that costs her, and it costs her everything. By the end, you're not watching a magical girl save the day, you're watching a girl decide if saving the world is worth losing herself to do it.

A world on the brink of collapse calls for desperate measures. The Ainsworth family possesses the means to restore humanity's dying planet through the Holy Grail, but their plan demands a terrible sacrifice: the life of Miyu, a magical girl caught between salvation and damnation. When Shirou refuses to surrender his sister without resistance, the burden falls to Illya to forge another path forward. With a world that can no longer sustain life, Illya searches for a way to rescue both Miyu and everyone else, while facing the question of what she will do if one innocent girl's life is truly the price of survival. The movie pairs fantasy action with drama, weighing sacrifice against the fate of the world.