Stella from Magical Lollipop gets namedropped in this chapter. (retroactively you can also assume she was also the cover model in the no-not in chapter 11).
This is the strongest indicator that YSD actually takes place in the Kitakubu-Lollipop universe. The only real sign of it before was UFA, which is just a brand. An actual character feels pretty definitive (though as signs go I think sneaking News x it somewhere would have been smoother).