I received the last volume from RACS a few days ago, but only unpacked it now. And what do you know, the cover is from The Best Episode.

If everything goes well, this is the last show that I bought in singletons, ever.

DiGiKerot reminded by e-mail that without the OVA my collection is not technically complete. But while true, it's immaterial for one-volume releases. I was only concerned about being unable to put a set together due to cancellations.