Shounen Note
By: Kamatani Yuhki
Genre: Coming of Age
Serialized In: Morning Two
Publisher: Kodansha
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The story of a boy named Yutaka, soprano soloist in his middle school choir. Yutaka possesses a great ear for music and beautiful voice, at least until he hits puberty and his voice begins to change.

From the Mangaka of Nabari no Ou