在海边的城镇，日之坂生活的高中生行合渚，小时候听祖母说过"言灵"的故事，如今也对此深信不疑。不断许愿的话就一定能实现。如果净是说些怀的东西的话，那就会成为现实并返回自身。那就是所谓的言灵。渚有三个儿时玩伴。曲棍球部的枫、擅长做点心的雫、还有现在在别的高中上学的滨贺家的大小姐夕。但是枫和夕总是一见面就发生口角。渚虽然喜欢着枫，却对使用严厉的言语来争吵的枫没辙。于是这也成了压力。一天，渚进入了一个没人使用的咖啡店Aquamarine。在那角落有着迷你FM电台的设备。渚因一时的心血来潮模仿起DI。虽然只不过是贪玩，但在偶然间渚的声音被放送了出去。矢泽紫音一人听到了那个声音。紫音为了照顾妈妈而来到了日之坂镇。之后，渚、枫、雫和紫音一起在迷你FM电台开始了正式的放送。到了8月，对电台节目熟悉的中原菖蒲、会作曲的琵琶小路乙叶也加入了进来，而且这里也正式地变成了Aquamarine广播。但是有一天，她们得知Aquamarine即将要被拆除--。
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