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Arisu Yamabuki, a high school sophomore, has been haunted by the memory of "Apollo," a mysterious radio host whose voice once brought him solace during lonely nights. Now, years after her sudden disappearance, Arisu is determined to find her, armed only with the sound of her voice and a burning desire to express what he couldn't back then. His search leads him to his school's broadcasting club, where he meets four talented girls, each dreaming of a career using their voices. As Arisu helps them pursue their ambitions, he begins to unravel clues about Apollo's identity, all while navigating the chaos and charm of their shared journey.
