Wasn't the afterword talking about the one that actually spanned multiple chapters here when they said that? That was a serialization that followed what was supposed to just be the first of a bunch of one shots. As for the plans to do more with the characters again later in a different time or such, not sure anything has come of that unless it got tucked away in one of the anthologies I didn't check very thoroughly on MangaUpdates.I would really like to see a continuation of the one shot at the beginning. The afterwards by the author made it seem like it was a serialization, does anyone know if it was serialized?