User blog comment:Crimson and Darkness/DxD Updates 2~/@comment-2208155-20190611153411/@comment-2601:87:8300:20D0:21B9:CA0F:3AE8:F5C9-20190615012501

If they are going in order and this is just a guest, but since it's a repeat of Kyoto arc in Sin 3, Shin 4 might be similar to Vol 10 with the Rating Game and then the festival, but since it's Vali's match the volume will be about Le Fay. Then again just a guest Shin 5 will be the return of the vampire country which will be Elmehilde' so volume. Finally Shin 6 is Issei match against the champ which will need Ravel's (her volume) help more than ever until the next match. It's also possible during that it's Royguns volume due to her relationship with the champ. Who knows maybe both like what there doing in Kunou's volume including Yasaka. These are all just speculation but your guest is as good as mine.