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Mio Takamiya is the first Spirit, known as the "Spirit of Origin," whose arrival triggered the rise of other Spirits and the world-altering Spacequake events. Her connection to Shido and Mana makes her pivotal to the storyline, embodying both the divine and a deeply tragic path. Summoned thirty years prior by human scientists, her first appearance led to catastrophic loss of life, setting.. Under her disguise as Phantom, Mio visits Kurumi with the intention of giving the Worst Spirit some advice. However, Kurumi coldly rebukes her and launches a hailstorm of bullets at her after sealing Mio's movements with her Seventh Bullet. The attack ends up destroying the protective mosaic surrounding her body, exposing both her identity and her appearance being identical to Reine Murasame.

Mio Takamiya is the First Spirit was the first Spirit to ever make an appearance on Earth. 30 years before the beginning of the events in Date A Live, she was summoned into the world by Sir Isaac Ray Pelham Westcott, Ellen Mira Mathers, and Elliot Baldwin Woodman through the Spirit Formula gathering all the world's mana into a single point. However, her birth also caused the first Spacequake.. Mio was first mentioned by Shido to Mana when he lost control of the Spirit powers sealed within his body. But during the events of Mukuro Planet, Shido could only remember the affection she had for him. After using in an attempt to regain his memories of Mio, it is revealed that Shido, in his previous incarnation as Shinji Takamiya, found Mio after a Spacequake and named her after.