The Heroes caught someone who was about to commit a crime, but they themselves seemed like they needed help, so Nezu enrolled them into the rehab program. For that reason

Aizawa💤: “Alright, everyone, quiet down, or I will force y'all to clean the bathrooms for a month" he said sternly at those brats

Everyone got silent as they listened to Aizawa announcement for today

Aizawa💤: “We have a new student... they are in the Rehab Program since they needed help but didn't know where to find it...so Please be nice...The tired teacher said, sipping his black coffee

Izuku📗: "Mhm...Rehab...this is interesting... And an opportunity for us to get to understand someone who-" the greenette was interrupted by the door opening

Sarōmi🐭 walked in shyly whilst fidgetting with her scarf, whilst looking at them... slightly afraid