User blog comment:B214/Volume 22 spoilers/@comment-30924344-20170128052407/@comment-24502975-20170128175956

If Ishibumi's starting to 'group' the girls together, the next series of confessions will be to the Church trio (probably appropriate considering theyll be fighting Dulio, like he fought Barakiel when he confessed to Akeno). The mention of an 'unexpected older sister' wasn't said to be someone new, so... Grayfia? And how big is the list of Ise's juniors we're talking about here... Kunou probably, would Lilith and Ophis count? Bennia and Le Fay?

Ahaha, volume 23 is gonna be fucking huge. I can't wait.