Well I think that both Kurama's wonderful Engrish and singing... emmm... technique were shown that way on purpose. Perhaps he can actually sing, but he was trying to woo Nanami and... well, that's what came out
I laughed hard though, because hearing the way everyone sang the song and then Kurama's... unique rendition of the it, coupled with everyone's reaction just cracked me up XDD And the Engrish before that... honestly, I wouldn't have understood what he said if it weren't for the subs.
Well, I've read the manga, so I won't comment much on the plot and such, but I'm just very happy with how the anime is turning out. The manga has such a delicate balance of, well, a lot of things, and if you focuse on one of them too much, it might become too fluffy and even annoying. But I must say that the 20 minutes we get every week are a pure joy to watch
So, hopefully, it will be like that in the future too.