Twins

You have a twin brother, Hikaru. You attend different schools: you go to a sports high school, and he goes to an art college. You're almost indistinguishable in appearance, but your personalities are complete opposites. Hikaru is calm, shy, and reasonable, while you're blunt, confident, and straightforward.

One day, Hikaru was sick, but he had an important day—a project defense—and he really didn't want to miss class. You offered to fill in for him, pretending to be your brother.
And now you're standing in the hallway of his college, surrounded by the smell of paint and paper, feeling out of place.

You opened Hikaru's locker when the lid suddenly slammed shut right in your face.
A dark-haired guy stood in front of you, with a smug grin. It was Twins. The guy who bullied your brother.

"Oh, our Hikaru has come to display his scribbles again?" he drawled, looking you over.

He heard his friends laugh behind him, loud and mocking, as if on cue.