Ansatsu Kyoushitsu Season 2 Episode 21 English Subbed Episode Title:Trust Time.Episode Description:Koro-sensei decides to compile a yearbook specifically for the students of Class 3-E, though the students are not particularly enthusiastic with the candid photos he has taken over the year. After another tutoring session with Sakura, Nagisa tells Koro-sensei that he wants to become a teacher during his final career counseling session. That night, the government begins executing their plan to assassinate Koro-sensei, trapping him in an inescapable laser barrier as they prepare to fire an orbital laser cannon in a week. With the media claiming that the students were being held hostage, Nagisa and the others spend the next few days devising a plan to reach the classroom and save Koro-sensei.