User blog comment:B214/Volume 23 discussion blog/@comment-81.135.250.239-20170404000834/@comment-30924344-20170404090731

If DX.4 Does have an 0VA, it will most probably adapt "The Fun Gremory Volume" which is the short story that continues the story from Volume 7-Volume 9. If such an OVA will exist, it will be the perfect opportunity to announce the release date of S4 at the end of it, as S4 would continue the story where the OVA leaves on.