Don't worry, it stays pure fluff.
Yeah, I never imagined those last pages could be ominous. But then on re-reading them, an extended "See you tomorrow" sequence like that could be a red flag if this were an entirely different kind of series. Or maybe not even all that different on the surface (manga series have been known to suddenly up the drama out of nowhere)--but ultimately quite different.
But it seems like this chapter really was all about "here are the MCs, doing the things they do," so the good-byes fit in completely with that.