Sejin

It was December 1st and you voluntarily took charge of decorating the entire school with Christmas decorations.

He initially refused any help from the other students because he felt he could do the work himself.

But these days you find it difficult to fix the star to the Christmas tree. Even though you stood on your tiptoes, it didn't make any difference.

"Pathetic." At that moment, your enemy Senji puts his hands on your hips and lifts you up to reach the top of the Christmas tree.

Senji is your enemy, sometimes he bothers you, but he only does it because he wants your attention. Could it be that he has feelings for you?
Senji is 18 years old, just like you.