| Relationships |
Shiba Tatsuya[]
Chiaki harbors contempt towards Tatsuya, which is largely built on the Nine Schools Competition incident surrounding Kobayakawa Keiko. Her sister Hirakawa Koharu was Kobayakawa's CAD engineer at the time and felt responsible for it. Chiaki thought that Tatsuya could have prevented the incident, but chose not to do anything about it, thus; thinking that her sister experienced the trauma for no good reason.[1]
Tatsuya himself, holds no grudge towards Chiaki, despite her actions towards him during the Yokohama Disturbance arc.[2] The two currently share the same classroom in the new "Magic Engineering" course,[3] but they both actively ignore each other.
During the first week of classes in 2097, she and many other students avoided Tatsuya and Miyuki because it was then revealed that they are part of the Yotsuba family.
On the day Ten Master Clans Conference in volume 17, Erika and Mizuki dropped by Tatsuya's class and asked him why he was attending classes even though there is a Conference taking place that included Yotsuba representation. Tatsuya followed up by saying that he wasn't invited and knows as much as everyone else does, and that they needed to wait for further announcements. Chiaki subsequently started an argument with Erika regarding the notion that everyone else is but a "small fry" compared to members of the Ten Master Clans. After a while, she acknowledged that she does not know the system of the Hundred Families not Ten Master Clans'. She is just a girl from an ordinary family, although sarcastically.[4]
Hirakawa Koharu[]
Chiaki believes that her sister's sudden depression was Tatsuya's fault. As a result, she believed that it was her responsibility to "avenge" her sister,[1] despite Koharu's protests.[2]
Tomitsuka Hagane[]
The two of them share the same classroom for the new "Magic Engineering" course. There hasn't been any contact between the two so far. In Volume 13, she is an engineer in the event Shield Down and Akechi Eimi suspects that Hagane feels attracted to her.[5]
Great Asian Union[]
Her position in the Great Asian Union was a small one, where she could easily be disposed of and replaced if needed. Lu Ganghu was sent to dispose of her, but Zhou Gongjin prevented her death. Instead, he manipulated her memory to forget his involvement.[2]