I don't know about anyone else, but I have read up to ch 11 so far and i am honestly hooked. The storyline for this is absolutely unpredictable - well 90% of the time.. ^^. I cannot wait to see how the story progresses I like the fact that Aoki-sensei always shows the point of view (inner thoughts) of both Aki and Riko. From the music side of things, like NANA (before the anime and LA), it really makes you think what the music sounds like as well.. I really really hope that an OVA or anime comes out from this (not really a big fan ofLAs).

Sorry if isn't helpful. When I read more, perhaps I will update this :) also it's hard to make a review without any spoilers

As mentioned, only read 11 chapters but already overall 9.. I'd give 9.5 if i could, the only thing I don't like is Riko's hair, but maybe Aoki wanted a reason for Aki to give a nickname for Riko ^^ XD and also, I don't think any of Aoki-sensei's previous work had a main female character with short hair before..