Tsubasa Nanase/Relationships

Kiyotaka Ayanokōji
Tsubasa seems to hold an interest in Kiyotaka ever since she was first shown in the series as she frequently looks at him as if she was trying to learn who he was. While Tsubasa keeps her polite facade around everyone she sometimes slips when she is talking with Kiyotaka and reveals her true feelings without realizing it. At the end of Volume 1 after Housen had stabbed Kiyotaka she looked at him with eyes of hatred and admitted that she helped Housen because she believed he didn't belong in this school.

In Year 2 Volume 2 her polite attitude returns when she talks with Kiyotaka again but before she left she told him to make sure not to leave any regrets in his time left in school with a strong determination in her eyes.

In LN Year 2 Arc, Volume 3, she has a plan to team up with Kiyotaka to "act" close to him. But her main goal is to avenge the death of her old friend, which involved Kiyotaka's father. When they're at the mountains alone, she finds her chance to fight against Kiyotaka, but was utterly defeated by him. She then tells Kiyotaka her reasons, explaining that Eiichirō Matsuo, the son of the butler that helped Kiyotaka escape from the White Room, was her closest and dearest friend. Unfortunately, Kiyotaka's father took revenge on the Matsuo family by chasing his son out of high school, causing him to keep dropping out. No matter what school he went to, Professor Ayanokōji would chase him down as a revenge for his father letting Kiyotaka escape. Eventually, Matsuo burned himself to death, and Eiichirō would also eventually take his own life. Tsubasa said that Tsukishiro approached her and told her that if she managed to expel Kiyotaka, he would let her meet his father to apologise to her regarding Eiichirō's death. Kiyotaka thinks that even if she managed to expel him, his father will never bow to anyone. Kiyotaka then tells her that his freedom is Matsuo's own decision and he won't betray and waste his butler's wish. Tsubasa, who just finds out about the fact, realises that all her actions have done the opposite. She then promises to help Kiyotaka at the end of the volume.

Suzune Horikita
Tsubasa and Suzune seem to have a cooperative relationship in Year 2 Volume 1 as they both understood that they need to work together in order to have both Year 2 and Year 1 D Classes cooperate and survive the Special Exam with no dropouts. They helped each other through most of the volume until it was revealed that while Tsubasa did want the cooperation of classes her and Housen's main goal was to expel Kiyotaka which caused Suzune to be more suspicious of her afterwards.