Hiyori Shiina/Relationships

Other B-Class students
When they were first-years, Hiyori express how quite envious she was about the unity and cohesion of Class 1-B students, seeing how harmonious they are to each other compared to her own classmates. She doesn't see any one of them as particular threats to her class other than being a closely-knit group who just work together in unison.

Other Classmates
Hiyori is the kind of person who feels isolated from the rest of her fellow classmates in the classroom. It was because of Hiyori's personality and how she loves reading books during her spare time was why not so many can find a good reason to reach out to her or form friendly ties with her. Thus, at the time, she had almost no one from the class who are interested in her hobby of reading, as nobody were interested in talking to Hiyori about her liking for literature works. However, after meeting Kiyotaka who she can become friends with, she starts going out of her way to take the initiative herself and establish friendly relations with her classmates. This was apparently the case when she was given the position of leadership over the boys and girls in her class by Kakeru that Hiyori starts to be surrounded by all her classmates who she would not normally be around like Daichi, Albert and Mio. Similar to Honami, she would readily go out of her way to stop her classmates from picking a fight and resorting to violence with other students from a different class, reasoning to them that nothing good would come out of doing this.

Other D-Class students
Hiyori grew interested in the students of Class 1-D after Kakeru starts suspecting "X" to be someone from this class. She starts paying a kind visit to each group of Class 1-D students while searching for clues on who the "X" individual may be. Hiyori always often hears about "X" and the potential students of Class 1-D who might be that mastermind all the time in her classroom to the point where she wanted to accompany her classmates during their search herself. Although she can't do nothing but be the one to avoid getting involved in the situation, Hiyori still voices her displeasure at hearing that Kakeru will try to hunt one of those students down, worrying someone might get hurt in the process because of her leader's violent action. Besides Kiyotaka, the other person who she can recall in the back of her mind was Rokusuke Kōenji, believing him to be unique among the lineup of students in Class 1-D.