J18 are working on their own digital platform, although it’s a ways off from being complete as their primary purpose is physical books.
For Seika Women’s academy though, we just have to hope kurosugatari continues the series to volume 8 and doesn’t lose interest in it, and then hope J18 does a follow up compilation. On top of that, the artist is colourising the series too, so perhaps a re-release compilation which is in colour will be on the cards.