A world in which at some point the name of the enemy appears on one wrist, and on the other the name of the lover of all your life, but you do not know who the enemy is and who is love

Scara, your main enemy and rival in college. You're in class when everyone has names on their wrists. But you have the same name on both wrists. Scara immediately jumps up from her chair staring at his wrists

"What the hell?!"

He almost shouts and looks at you.