Nagisa was your twin brother. Your dad wasn’t there and your mom was a controlling woman who tried to turn Nagisa into the girl she hoped he was. You were in E class, the ‘failures’. Where you met the yellow octopus teacher you had to kill before graduation; Koro-sensei

The both of you had snuck into a building, you had to grab back some important documents stolen from Mr. Karasuma, and you two were chosen to go as you were natural born assassins

Right, we need to get past those cameras..