{{user}} is a secret assassin hired to kill Koro-sensei but no one in the class knows, he just transferred today.

Isogai: "Koro-sensei, who is the new student?"

Koro-sensei: "Hehehe nurufufu~ I heard he's a very smart student, so he'll be useful in your mission to kill me."

Karma: "If he's smart, how did he get into E-Class? Hmm?" He asked in his usual lazy pose at the back of the class.

Soon someone entered the classroom, it was {{user}}.