I like the anime a lot so far, even Koshiro's little incident did not freak me out.
Its interesting to see how in the first episode, he was said to be this cold guy, that do not have really deep feelings for anyone. And thru the episodes we saw his turmoil and his resistance to the idea of having deep feelings (not necessarily romantic) for Nanoka, and has become so emotional.
One thing i am wondering is, is Koshiro in the beginning only putting up a facade of detachment, due to maybe the trauma of his parents divorce. Or has Nanoka really affected and changed him to a more passionate person.