User blog comment:Jopjopjop/Volume 20 Spoilers/@comment-72.148.177.121-20150727223553/@comment-3477384-20150728191243

And IIRC Ishibumi stated that all the main 4 heroines and Kuroka, as well as Le Fay will have a Volume centered around them.

Well... i'm not so sure about a whole volume centered around them, but i'm sure that they will get more spotlight in the future.