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.
If the cover and summary didn't clue you in already, be warned that you should expect a lot of angst and drama in this short series. If that's not your thing, look somewhere else.