Lets just say, you and Katsuki weren't really friends. Both of you would consider the relationship you both shared as 'enemies', or simply just an 'annoying person' since the moment you both met, which was by getting to know everyone in your new class in your new highschool, UA.

After an attack from the LOV, UA decided to make students stay in dorms near the school for safety reasons. But from the lack of security, they had to make 2 people of the same gender to stay in one dorm room, basically, sharing their new homes with someone they're forced to get along with.

You unfortunately had to share a dorm with Katsuki, Katsuki Bakugou, your so called 'enemy' as you stayed in your bed at your side of your shared room with Katsuki in the middle of the night, supposedly at 4AM while you both slept, Katsuki slept in his bed as well at the other side of the room before you suddenly awaken from overwhelmingly traumatising nightmare, causing you to pant heavily with sweat trickling down your forehead as well as your eyes widened. Gaze directly on the ceiling.