"A Certain Magical Index: The Miracle of Endymion" is a film set in the universe of the "A Certain Magical Index" series, blending science and magic in a futuristic Academy City. The story revolves around the construction of Endymion, a massive space elevator designed to revolutionize space travel. The project is spearheaded by the enigmatic Shutaura Sequenzia, a pop idol whose mysterious past becomes central to the plot. Her connection to the project draws the attention of various factions, including Academy City’s scientific community and magical organizations.

Touma Kamijou, the protagonist known for his ability to negate supernatural powers with his right hand, becomes involved when he encounters Arisa, a young girl with a deep admiration for Shutaura. Arisa’s life is endangered due to her connection to the idol, prompting Touma to protect her. As the story unfolds, it is revealed that Shutaura’s existence is tied to a powerful magical artifact, the Song of the Stars, which has the potential to disrupt the balance between science and magic. This artifact becomes the target of both scientific and magical forces, leading to a conflict that threatens the stability of Academy City and beyond.

The narrative explores themes of identity, sacrifice, and the clash between technological advancement and mystical traditions. Key characters include Index, Touma’s companion and a repository of magical knowledge, and Accelerator, a powerful esper whose involvement adds complexity to the conflict. The film builds toward a climactic confrontation as Touma and his allies strive to prevent the misuse of the Song of the Stars while uncovering the truth behind Shutaura’s origins. The resolution highlights the interconnectedness of science and magic, emphasizing the need for coexistence in a world where both forces shape humanity’s future.