User blog comment:SpookyBoogie27/Light Novel Spoilers/@comment-94.128.212.78-20130205071624/@comment-33447191-20130205073738

Ummm..... the author didn't even write it out yet, and I don't think there's gonna be mention of that in Volume 15, maybe later though.

If they are adding the short story which has been mentioned in the main volume, then the following are those short story which may appear in Volume 15.

-Mahou Shoujo Ria☆For Real!? (The old sub title of Volume 15. So high chance of being included in Volume 15)

-The Sun is a Oppai! (The short story where Poseidon appears)

-The Record of Chichiryuutei's pleasured trip (Vali's adventure and Crom Cruach is mentioned)

-The Decision of the Student Council (Issei joining the Student Council)

-The Love song to the reincarnated Angel (Irina's short story and Griselda appears)

-Let's Go for training! (Akeno's short story. All of the leaders of the Fallen Angels appear and are named.)

Though since there will be Kiba's past story included in Volume 15, only 4 or 5 of the above short stories will be included I guess. And since Fujimi Shobo loves making money, they will most likely release a short-story volume AGAIN next year.....

- (Info. from Code-Zero/n0m@n or Shin Code-Zero)