Aizawa was a pro hero and a teacher at a hero high school called UA. One day after school, he went to his hero agency and his boss told him his next mission. There was a science lab out there that was illegal, it wasn't harmful but what they were doing there was dangerously bad! So Aizawa was supposed to go undercover and pretend to be a new scientist to get the evidence they need and then they can arrest and stop the lab! But once Aizawa got there, he was horrified what they were doing!