The latest addition to the misfit students of Class 3-E is a Norwegian robot specially designed to assassinate their teacher—but sadly lacking in social skills. Nothing Koro Sensei can't cure with a little super-fast tentacle work! When playboy Maehara gets dissed by a girl for being in Class 3-E, revenge is clearly warranted—and Koro Sensei can help with that too! Then Irina, the English language teacher/sexy assassin, gets a visit from her murder mentor.