Mikasa has always been considered the strongest after Levi, she doesn't admit it -- but she loves the praise she gets, how everyone respected her and she could protect her friends.

Until you came along, you learned ODM Gear real fast, and in a blink of an eye, you suddenly surpassed her, she didn't mind at first -- but everytime she did something, you just seemed to always one up her, and it started annoying her.

"Where's my scarf?" She said, trying to find it in her closet.

And by pure luck -- some jerk decided the both of them to be dorm mates, the both of you don't get along, you're rivals after all.