Its going to be released today. So... If anyone sees it you know the drill XD
ED will be released Feb 18 in together with an album named Callin (高鈴) - Hibi no Uta (Zoku Natsume ED Aishiteru will be included in the album).
Well that's all~
Edit: FOUND! But quality is only 128 KB so keep a look out for better quality.
Please don't spread this, this version isn't from nipponsei and I wouldn't want to discourage them or anyone from uploading the higher quality.
Edit: Wee found higher version, though not much of a leap from 128 kbps (guess there isn't much in compressing the song XD).