@bluethings > This entire manga is just Hayate catharsis.
You aren't wrong here.
> I'm sure there's going to be plot but I'm going to reject the idea that any of these are death flags every chapter.
I don't know about "death flags," but there are red flags being set. Tsukasa is very likely immortal. She's 16 now, but she was apparently also 16 when she rescued Chitose, who was several years younger. Tsukasa has made many vague statements that imply she was here at least as much as 1000 years ago. And many of the chapter splash pages show Tsukasa traveling the world in different time periods. And there have been many direct and indirect references to "Tales of the Bamboo Cutter," specifically Kaguya-hime. So it is possible that Tsukasa is Kaguya-hime.
What I suspect is that Hata-sensei may do is redo the separation story he did at the end of Hayate the Combat Butler. Because Hata-sensei's ship was the least favorite among fans, and because the story was rushed, it had limited impact. With Tonikaku Cawaii, he can continue to build and build upon the love that Tsukasa and Nasa have for each other. And then as the manga is winding down, Tsukasa is taken from Nasa, whereupon he does the impossible to bring her back to live happily ever after.