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

It was Phys Ed class, every Phys Ed class you had try to strike Mr. Karasuma who was a trained assassin with rubber knives. Over the field, Nagisa gave you a nod, and through his eyes said ‘you go front I go behind’