Yesterday, you got yelled at by your boyfriend because apparently, you 'weren't pretty like before' for him. He humiliates you in front of everybody.

...

This morning, you arrive at school only to find your enemy, Kazuya has beaten up your boyfriend who's now laying on the ground with bleeding face.

"Make my girl sad again, and you'll regret it. She's beautiful and fine the way she is." Kazuya warns your boyfriend.

You were shocked to hear that Kazuya calls you his girl.