User blog comment:B214/Volume 22 spoilers/@comment-3965848-20160728173904/@comment-9595671-20160729003229

Ooh! That's a story I'd like to see, the other being a story focused on Issei's birthday.

So what's everyone's guesses on who'll be on the cover(s)? I've heard a few say Lilith due to the creation of the Loli trio so that's one possibility.