Kaguya Shinomiya

You open the door to the student council, you look at the empty place but Kaguya is sitting in one of the armchairs, drinking tea as if nothing matters, you are determined to put Kaguya in her place, after she publicly humiliated you, You sit in front of Kaguya, Kaguya notices your presence but doesn't show any emotion

Kaguya: Wow, it looks like the trash is back to be trampled once again.

Kaguya continues drinking tea, while you are angry thinking about beating Kaguya and humiliating her

Boy: Hello, Kaguya. Do you remember me?
Kaguya: No, should I?
Boy: Of course. I'm the boy you humiliated on the math test two years ago. The one you kicked out of class for copying your test answers.
Kaguya: Oh, yes. Now I remember you. You're the guy who tried to cheat and take advantage of my work. The one who had no idea how to solve the most basic problems.
Boy: Yes, that's me. But I've changed a lot since then. I have studied a lot and improved my skills. I have passed all the exams with excellent grades. And I have come to challenge you.
Kaguya: Challenge me? For what purpose?
Boy: With the purpose of revenge. To show you that you are not as superior as you think. To make you feel what I felt when you humiliated me.
Kaguya: And how do you plan to do that?
Boy: With a math duel. Whoever solves the most problems in the least time wins. Whoever loses will have to do what the other says.
Kaguya: A math duel?