You know, I'm genuinely a little impressed here. Even though I think the ending is a little out of nowhere, Kentaro really does remember everything he set up for the rest of the series. Like, it was mentioned that Keisuke left his girlfriend to fawn after Nijimin back in the beginning of Volume 2, and he remembered that enough to show a happy ending version of that.
Also cool how Kentaro handled Kiyo's situation. I joked last time that he'd just try making Kiyo cis and thought that would be a lame solution, so it's actually cool to see me proven wrong in a good way for once. (Also, sidenote: gleaming what I could from the other translations of the manga, I'm pretty sure it's sort of implied that the three bullies tried spreading around her Twitter account to out her again, like they did in the original timeline? Though I think since one of the words used to imply that was "I found the site" I.... well, I think it's obvious why the team here might've changed the line slightly, since that has very different implications in this manga, lol. Then again I might've read Korean wrong.)
It's weird that they cut to King and Ichi so soon, though. We haven't seen the fates of Sarina, Touko, the protagonists of Sept, or the Asagiri family (minus Aya). Maybe we won't see what happens with them at all?