Kei Karuizawa/Relationships

Yōsuke Hirata
She seems to have a close relationship with Yōsuke as when the school first started she cheered on his idea of the class introducing themselves.

After several days of school, they seem to have formed a bond as they are often seen together. In truth, they're just pretending to be in a relationship in order for Kei to not get bullied in school so it is unknown how they really feel about each other.

Suzune Horikita
They don't have much interaction but don't appear on good terms.

In episode 7, she was rather callous to her and told Yōsuke they should go.

During the survival test, after Yōsuke is chosen by Kei to watch over the boys in the class, Suzune steps in. She doesn't oppose Kei's request of watching the boys but requested another boy join him on guard duty since he needed to be watched as well. After Kei mentions there was no other boy who seemed trustworthy, Suzune selected Kiyotaka.

Kiyotaka Ayanokōji
During the survival test, when Yōsuke is chosen to watch over the boys in the class, Suzune requested Kiyotaka join him on guard duty since he needed to be watched as well. While he is picked, Kei notes on him being invisible to the rest of the class, showing that she barely acknowledges his presence in their time as classmates.

Due to his real thoughts, it is unknown what he really thinks of her.

Kikyō Kushida
Kei and Kikyō appear to be on good terms. In episode 2, Kei went to Kikyō for points as she was out of it after blowing through her own funds and seemed desperate for points as she used their friendship as an excuse to do so but it appears Kikyō didn't go through with it.

Satsuki Shinohara
Satsuki is one of Kei's friends in class 1-D. The two can often be seen interacting with each other in the anime and getting along very well.

During the survival test, Satsuki was among the many girls that took up for Kei after her underwear was stolen.

Maya Satō
Maya Satō is one of Kei's friends in class 1-D, as they get along well. The two can often be seen interacting with each other in the anime and getting along very well.

During the survival test, Maya was among the many girls that took up for Kei after her underwear was stolen.

Chiaki Matsushita
Chiaki Matsushita is one of Kei's friends in class 1-D.