User blog comment:B214/Volume 22 spoilers/@comment-30924344-20170128052407/@comment-1359322-20170128061216

From what Ishibumi said it'll focus on Asia, Ravel, Xenovia, Irina and Elmen. Explore on Dulio's team, Rias' team two new members, Ise's junior and Ise's changed/growth in mentality as a High-Class Devil and third year student.

In short a huge cluster of object in one volume. And we might even see the next person who Ise will make his life promise with. So now we have:


 * 1) Rias
 * 2) Akeno

Who you think is next.....