Assassination Classroom Episode 4 English Dubbed Episode Title:Grown-Up Time.Episode Description:The students of Class 3-E are introduced to their new foreign language teacher, Irina Jelavić, who is actually a professional Serbian assassin with no interest in teaching the students. After being seduced by her, Nagisa shares all of his notes about Koro-sensei's weak points to Irina. When Koro-sensei returns, Irina ropes him into the storage shed, so that her team of assassins can kill him. However, this fails as a result of using the wrong ammo on purpose and ignoring his keen sense of smell. Later, after the students of Class 3-E rebel against Irina when she refuses to teach them properly, Karasuma shows her how dedicated Koro-sensei is to teaching each of his students and how important education is for assassination. Realizing the error of her ways, Irina begins to earnestly teach her students, helping them learn the art of communication.