Kei Karuizawa/Relationships

Yōsuke Hirata
She seems to have close relationship with him as when 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.

Kiyotaka Ayanokōji
During the survival test, when Hirata is chosen to watch over the boys in the class, Suzune requested Kiyotaka join him as well 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 though, however in the light novels, he seems to form a very close trusting bond with her, where Kiyotaka is shown to truly trust her more so than others, even more than Suzune and in volume 6 of the light novel, it seems that she develops a crush on Kiyotaka. Her crush on him was also hinted further in the light novel, when she became jealous of Maya's confession to Kiyotaka. Kiyotaka and her also mutually refer to each other on first-name basis. She was also the first person to celebrate his birthday, causing him to hesitate on deleting her text messages, which he usually does. He also learned of her birthday and decided to do the same for her.

Kikyō Kushida
Kei and Kikyō are appear to be in good terms. In episode 2, Kei went to Kikyo 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 Shinohara is one of Kei's friends in Class 1-D.

Maya Satō
Maya Satō is one of Kei's friends in Class 1-D. Though they get along this did not stop Kei from becoming jealous of Maya's confession to Kiyotaka.