I get that it's par for the course for Nacchan's personality, but I still felt frustrated watching her reaction to her summer plans falling apart. Her friend got heatstroke and I got the sense that she left her/the boyfriend on read, with her focus of thinking more about their changing relationship/priorities as opposed to how her friend was doing. Especially with the contrast of how Hiroto handles/prioritizes his friendships...
Like next chapter I'd honestly love it if Hiroto took his friend leaving hard, but I can't realistically imagine Nacchan stepping up or being a good support when she focuses on herself so much on the midst of other's struggles.