You know I typically have reservations about these sorts of developments for a few reasons already raised. (It feels like a cop out for indecisiveness or doesn't permit proper heartbreak or rejection etc.)
My main concern here is If Rin and Kurohime agree to this, then the temptation is to slot everyone into a Toudou harem, and that is not the ending that is justified by either Rings commitment, or (I would say especially) Kurohime's feelings.
Our girl has had at least 50 chapters of development to get here, she deserves some exclusivity, and I would hope that make it a true, healthy poly relationship the next few chapters after they agree to this are focused on Rin and Kurohime exploring each other and their feelings for each other independent of Toudou. I liked their interactions in the dodgeball arc, and it'd be nice to see that development taken further.
I do have confidence that the authors will pull this off though. Having turned a dubious concept into one of the best thought out and portrayed examples of love in all its messy glory in modern manga.
(Also for those calling for Yanagi to be added, what the hell man she has the vice prez right there!)
Whilst your concerns are valid (and the Ruruka flashback is funny) I think Toudou is a little more selective than some fans give her credit for. If Rin and Kurohime didn’t already have those past interactions of mutual respect to build on this could have been a throwaway idea. But they do. Adding people like Yanagi, or the Prez, or Ruruka WOULD be just adding people for the sake of a harem route. As it stands, IF Rin and Kurohime approve, I see this as a natural progression of these characters growth.
Because, knowing the authors, this wouldn’t just be an instant puddle of naked girls all the time. There’d be awkwardness and missteps and jealousy like the beginning of any new relationship. Exploring being in a polycule in reality, rather than what harem fans (or many polyamorists) imagine. And heck, maybe some other people COULD be added down the line, but only thoughtfully and with both care and development. And they might not agree, or agree and it not work out! Whatever happens the last thing I see happening is that it works out flawlessly without comment.
And so THANK YOU RURUKA, but I don’t see you joining the love puddle at any point until you grow up a little bit.
And THANK YOU ASTERIST for all your hard work and dedication. You made A LOT of people happy today! 💜💜💜💜
Now: CAN WE PLEASE GET TO THE NOT AT ALL INCESTUOUS HOT SPRING HOLIDAY SPECIAL?!? (iykyk)