I still legitimately expect Yuko to suddenly climb out of the river or wash up somewhere further downstream and someone finds her and takes her either to the hospital or police station to heal or bring her back home, be it right after she gets out of the river, or after enough time for Reiji to finally move on/cope/sort through his emotions lol
I'm in favor of the second, cause nothing would drag him even further down the Abyss than to find out his mom had been alive the entire time, and give her more ammo to gaslight him into more guilt and pain for not putting any actual effort in trying to search along the river for her or her body.
That being said, it's really interesting, cause if Yuko really is dead now, then that means one of, if not the main, source of the story's conflict is now gone. Which can only mean that the series might even be ending soon since all that's left is to tie up some loose ends and subplots before finishing the rest of the main story, cause without Gen and Yuko, the remaining characters with arcs or conflicts are Reiji, Aoi, Chako, Yuri-sensei, and Kazumasa. At least in terms of main and important secondary characters in relation to Reiji himself.
Granted, that's still enough plot and arcs to keep the series running long enough that the end can still be considered a long ways off, but Yuko and Gen are literally the oldest and closest sources for Reiji. Resolving their stories/characters before resolving the others just feels like a legitimately backwards order of operations, and kinda like Minenami took the term/phrase "trope/genre subversion" and "flipping a genre/trope on its head" literally lmfao