Sentimental Dust by Kawai Rou — Ongoing

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Ayu and Hitsuji have been friends since kindergarten, but when Hitsuji tries to take them a step further, Ayu panics. Trying to maintain the blurry boundaries of their friendship proves difficult however when she soon has to watch helplessly while Hitsuji is gravitating towards the new music teacher.

Chapter 1 released Jan 19 '15
Chapter 2 released Feb 18 '16