故事发生北宇治高中,黄前久美子(黑泽知叶 配音)刚刚踏入校园,对于未知的高中生活,久美子充满了憧憬。加藤叶月(朝井彩加 配音)是久美子的同级生,在叶月的极力劝说之下,耳根软的久美子在半推半就之下加入了学校的吹奏乐部。曾经,吹奏乐部有着十分辉煌的历史,然而,在换了顾问之后,吹奏乐部渐渐落寞,如今,音乐老师泷升(樱井孝宏 配音)作为新的顾问新鲜赴任,他对重振吹奏乐部,进军全国大会有着极大的信心。个性乐观开朗的川岛绿辉(丰田萌绘 配音)、理智冷静的高坂丽奈(安济知佳 配音)、大姐头田中明日香(寿美菜子 配音),在这些前辈们的陪伴和指导之下,久美子快乐的高中生活就此拉开序幕。
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