就读北宇治高中的铠塚霙（种崎敦美 配音），在管乐团中负责吹奏双簧管；伞木希美（东山奈央 配音） 则负责吹奏长笛。国中时，希美主动对孤单的霙搭话，从那刻起霙就将希美视为自己的全世界。霙现在每天都感到很幸福，因为有希美在身边陪伴她，但同时也害怕希美是否会再次消失在自己面前…… 身为高三生的两人，即将参加最后一次的音乐竞赛会，自选曲是〈莉兹与青鸟〉，这是一首以童话为蓝本所创作的曲子，为双簧管和长笛共演的独奏曲。「霙是莉兹，希美是青鸟」两人一边将自己的情感投射于童话故事中，一边练习曲子度过不安焦躁的每一天。总是不太契合的齿轮，为了寻求相合的瞬间，而不停地转动著……究竟霙是否能对希美坦露自己真正的烦恼呢？
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