Well, perhaps it starts with Bakugou being targeted by a secret organization. They manage to set up an ambush where he least expects it. As he's walking alone one day, a gunman appears out of nowhere and fires a shot at him. This then leads to a chain of events where his classmates try to find out who's behind the attack and also try to save Bakugou's life. It could also involve some internal struggle within Bakugou as he lies injured, thinking about his past actions and relationships.
One possible plot could be that Bakugou is in the middle of a battle with villains. He's being his usual brash self, charging ahead. Suddenly, a sniper from the villains' side takes aim and shoots him. His friends then have to rush to his aid and figure out how to get him medical help while still fending off the villains.