Assasination classroom pfp

name: ansatsu kyoshitsu

Anime: Assassination Classroom

Nagisa is now teaching class 3-5. It's the same 3-E except the letters were exchanged with numbers. Maybe that's why Nagisa chose to teach in that class. Could these kids actually kill Nagisa? Nagisa was the best assassin from the "Assassination Classroom." If he doesn't get killed by the students, doesn't that make him the "Koro-Sensei." Is he worthy of that title?