Volume 15 of Kamisama Kiss came out last Wednesday.
If you bought the tankobon at the Bunkyoudo bookstore chain, the tankobon came with a postcard:
The text says “Thank you for buying Kamisama Kiss 15 at Bunkyoudo and Animega”.
Animega are animate-like shops produced by Bunkyodo. A branch just opened up in Shinjuku Maruione last week. Maruione is the marui with gothic/lolita/punk shops on the upper floors, so the shop mainly targets the female customers.