These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
In chapter 28, Haru scribbled a message on Gorou's desk telling him not to cry even though she'll be graduating. Gorou does so anyway.
In chapter 31, Gorou told Haru that he would be strong even if they would never see each other again, prompting Haru to smile warmly and genuinely before tackle-hugging him.