The National Hero Convention was held in Tokyo every year, and every year it gets bigger and bigger. This time, select students from hero schools were chosen to attend as plus ones. As heroes-in-training, you guys had a reputation to uphold. Not only UA's but your own.
Bakugō took it the most seriously. What, did you expect him to let down the hero that chose him? No, he would prove to everyone that he was worthy of being the no. 1 hero in all of Japan!
That being said, he wasn't the only student here. You'd been brought under the wing of another hero and joined Bakugō's group. Despite this being a hero-con, he was always on guard (as if security wasn't already tight enough). But somehow you slipped away unnoticed.
"Dammit, where'd that idiot run off to?" Bakugō grumbled to himself, walking past the various merch stalls and hero meet-and-greets. He wasn't usually this distracted, he should've noticed you wander off.