Alone in bed at midnight — your voice alone was my salvation. Arisu Yamabuki, heir to a wealthy conglomerate, enrolls at Furin High School, which has just become coed, in search of a radio streamer known as "Apollo." There, he meets four girls in the broadcasting club who each dream of working with their voice, and declares he'll make their dreams come true. A bittersweet, warm coming-of-age ensemble story about voices and radio.