Kōhei Katsuragi/Relationships

Arisu Sakayanagi
Katsuragi and Sakayanagi are often seen together and as the representatives of Class A. Therefore, the student body has the impression that they get along very well. From the beginning, it appeared that Arisu was the actual leader in their standing as Kōhei was always shown addressing and reporting to her when asking for her thoughts and actions over the matters concerning other classes. He is shown to have more of an advisory role and acts as her right hand man with all things concerning their class. When the two of them met Manabu, the Student Council President just weeks after entering the school, she was the one doing all the talking and receiving most of the praises as he stood guard beside her.

Despite their close partnership, it is mentioned by Honami Ichinose that the two have many disagreements on how to properly run things. Their personalities are also completely different with Arisu being the playful type while he is the always serious kind. After the incident at the survival test and his subsequent failure and poor standing after leading Class A, he then decided to follow Arisu wholeheartedly. He trusts and values her leadership greatly and dutifully follows all her orders when ordered. He also recognises her as the more capable leader as she has lead their class to victories countless times while also ever widening their class points lead over the others, something which he failed to do.

He became a subservient and obedient 'dog' to her after she expelled his one and only stalwart supporter, Yahiko Totsuka. Additionally, she threatened to take away more things from him if he ever chooses to rebel, betray or go against her or their class ever again. She forgave his previous actions and attempts to take away power from her and now has his complete loyalty. She is also the only one who he ever voices his discontent and fears with, although sometimes Arisu stops him before he can do so.

As of Year 2 Volume 2, his loyalty towards her and their class was trialed and tested. Kakeru Ryūen eventually convinced and persuaded Kohei to join his class instead and betray his former class. Arisu has not shown much thought towards the betrayal and even hinted that she expected it to happen. As of now, they are considered enemies of one another as he is looking for a chance to take her down and reinstate his position as the new Class A with Ryūen's class. On the other hand, she is excited at the new possibilities it brings and the methods they would use to try to take her down.

Yahiko Totsuka
Yahiko respects Katsuragi as the male Class representative and seems to follow his orders without question. This was shown when he was compliant with Katsuragi's order to stop harassing Class D after he was threatened by them and to avoid consequences for their class. During the survival test, Yahiko was amazed when Katsuragi deduced the purpose of the event though Katsuragi had told him to be silent as he didn't want anyone to overhear their plan.

Kakeru Ryūen
Not much is known about their relationship, in the survival test he two are shown forming an alliance to take down the other classes. When Katsuragi tried to shake Ryūen's hand as a sign of agreement, Ryūen told him not to overstep reminding him of his failure to reach the Student Council and walked off as Katsuragi became angry with this, showing the two have a mutual disdain for one another.

He eventually joins Ryūen's class after being persuaded that he would help execute his revenge against Arisu.

Kiyotaka Ayanokōji
Not much is known about their relationship as they haven't had any direct interaction. They caught a glimpse of each other on the school cruise but that nothing significant happened as Kōhei simply ordered Kiyotaka's group not to cause trouble.

They met again in the middle of the test when Suzune wanted to check out the cave at Class A was occupying though didn't directly interact.

Unbeknownst to Kōhei, Kiyotaka had ruined Kōhei's plan with Ryūen by sabotaging them in various ways, which in turned greatly ruined Kōhei's status among his classmates.