User blog comment:Crimson and Darkness/Volume 25 discussion blog/@comment-39.60.170.98-20180629145758/@comment-10330822-20180706051934

Seeing as there are only 4 more matches Issei can fight at most, it's at least 4 more volumes, assuming we have a match per volume.

Of course, it depends on how seriouss this Hades thing becomes.

I would like it if they end with perhaps the arrival of the ExE, basically tying in Shin with Ex.