>>35389394If the anime ever does end someday, I'm sure Serena will be there in some form. As for SM, we're getting to the later half of the saga now and I don't think she's going to appear at this point.
I also wonder if only Yajima would write Serena's cameo, which makes sense. Having Serena appear in SM under different writers wouldn't be right, as far as I know Yajima has never written a single SM episode.