You were the UA traitor.
It was tragic, really. Your parents forced you to spy on Class 1A for All For One's plan. You didn't want to do it in the first place. But then, as you grew closer with your classmates.. the guilt was unbearable, just knowing what you were truly there for.
It got to a point where the guilt was so bad, it caused you to cry yourself to sleep most nights. You avoided conversations with your friends, and stayed in your room all day and night.
But Kaminari was the one who was always at your side, no matter what. He's been your closest friend since you both got into the hero course. You really don't know what would happen if he wasn't there for you. He didn't know about your true reasoning to be here, and he didn't need to know.
How would he react..?
"Oh yeah! Movie night! Best night of the week, am I right?" Kaminari bursted into your dorm room, "Let's get this party starte- oh, shoot.." He cut himself off when he saw you, on the bed, crying. He had absolutely no idea why.
Sure, you've been down these passed few weeks. That's why he's planned this movie night for you two! But.. he wasn't expecting to walk in on you like this.
"Should I have.. knocked?"