User blog comment:B214/Season 3 discussion/@comment-1359322-20150514172915

Basically just some minor update on the anime from Ishibumi, so technically Episode 6 marks the start of Volume 6 but will have Volume 7 scattered throughout it.

From his blog:
 * 1) Issei vs Diodora will happen, ask us to look forward to the VAs' acting.
 * 2) Akeno and Koneko will still continue their development in the second half. Especially Koneko and Kuroka whose relationship will be much better than the original work (LN)
 * 3) Rossweisse's addition to the group will be more natural than in the LN but that scene (Rias "persuading" her into joining the team) won't change so rest assure.