No, and the thing the author made after this seems to have gotten more attention (In Japan, at least; I'm under the vague impression it's a comedy that might not translate well) so I'm a little worried we never will even if the author had intended to.
It stands up on its own, though. Even if it's not a conclusion plot-wise, thematically it works. But I'm glad I knew it was a non-ending before I got to it and was prepared for it, because damn if this series isn't an emotional live-wire all the way through.