Just finished watching and what a great show... the ending kinda way but kinda cliffhanger there making a possibilities of new OVA or such. Anyway I found this picture and suprised to see it. Not much spoilers actually as this does not appear in the series at all and is the DVD cover for volume 13.

source: http://product.bandaivisual.co.jp/web_serv...em_no=BCBA-2262

I won't talk much about the ending as not to spoil anything but for those who has seen it what is your opinion by seeing the picture?