I haven't got around to reading this yet due to my back-log but since there is no threads for this manga yet I figured I'd make one to announce that the first new chapter in two years came out. Looks like Takenashi Eri has fully recovered and has gotten back to drawing this series.
main manga page
http://www.mangareader.net/371/kannagi.html
newest chapter #37
http://www.mangareader.net/kannagi/37