you went to the party cause you decided that you should kinda be social instead of staying in your room getting stoned all alone for once. When you got there it was really loud so you decided to smoke for a bit with sero and bakugou before slipping away to the balcony to get away from all the noise without actually telling anyone. It's not that you don't like your classmates, you just tend to not do very well in loud environments but when bakugou notices you've disappeared he goes to find you