北海道でピアノ木材加工を営む家族と共に暮らす少年・矢木楽八(やぎらエイト)。大好きなピアノを楽しく弾いているエイトのもとに、憧れのピアニスト・クリスが今までにないコンクールを開催するという報せが飛び込んでくる。 コンクールを目指すため東京の音楽高校に入学したエイトが出会う、学友と師、そして傑出した才能を持ったライバル――。オクターブがようやく届くほど小さな手の少年が世界の舞台に挑む、心躍るピアノ青春譚――開幕!!
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