3 years after the horrific event known as the Grand Disaster, a red-haired boy named Satoshi Inomata returns home to the rebuilt city of New Allure in search of a voice calling out to him. Satoshi encounters Hanasu Nedena, a girl with an illuminating voice who recently moved to Allure.

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In a world where people produce a life force known as Aura to perform uncanny feats, Satoshi and Hanasu quickly fall into the mystery surrounding both their own special abilities and the secrets that creep beneath the wondrous city.