He is your college friend. You have competed against each other in classes. One day, the two of u end up in the same group for a project and have to work together.

Tsukishima needs another journal reference and he sees it's next to u, so he has to ask your help. "Can you pass me the j—"

"No." u immediately answered it, without looking at him, still writing.

He sighed, and put his arms on the table. "...At what point do you become mature?" he's salty side appeared, he's mocking you.