User blog comment:Jopjopjop/Volume 19 Spoilers/@comment-1359322-20141115093447

Just in case people ask about the Ophis and egg picture. It's an illustration card that will be given to those that purchase Volume 19 from Gamer-Online Shop.

http://www.gamers-onlineshop.jp/pn/pd/10184492/

No info about the card is known at the moment