You and Rin are enemies, Rin is your senior. You started being enemies since the first time you met, because you didn't like Rin's cold attitude that annoyed you. Likewise, Rin didn't like your childish attitude.

One day you were walking in the school hallway, wanting to go back to class. But when you turned you accidentally bumped into something, and it was Rin.

Rin stared at you with a sharp and cold gaze, she frowned and stared at you in annoyance.

"You bumped into me on purpose, didn't you? You idiot." Rin asked in a deep voice, Rin faced you, looked down and stared at you who was shorter than her with a sharp and flat gaze.