While Hachiman receives call from Haruno, it just normal conversation they exchange. However, in this part 4, she used her "trump cards" to him while holding her smartphone. Also I'll reveal Haruno's love in the past, & how Yukinoshita sisters' fight will end.
Why/How does Haruno start the operation Fire Doughnut that is arranging Hayama, Orimoto & her friend to hang out together? All answers are revealed in this part. She doesn't do it just for fun or messing around at all.
New character appears & interrupts HachixHaru. I should call to fire station, or else everything will... (kukuku) ?? What's this smell?
Fire Doughnut? Crazy! There's no way Yukinoshita Haruno will launch operation like that.