3 years after the horrifical event known as the Grand Disaster, a red haired boy named Satoshi Inomata returns 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 their life force known as Aura to perform uncanny feats, Satoshi & Hanasu quickly fall into the mystery surrounding both their special abilities and the secrets that creep beneath the wonderous city.